Four physical quantities that are conserved during a process include energy, momentum, angular momentum, and electric charge. On the other hand, two quantities that are not conserved during a process are mechanical energy and mass.
Energy conservation states that the total energy of an isolated system remains constant, as energy can neither be created nor destroyed, only converted from one form to another. Momentum conservation asserts that the total momentum of a system remains constant, provided no external forces act on it. Similarly, the conservation of angular momentum dictates that the total angular momentum of an isolated system remains constant if no external torques are applied. Lastly, electric charge conservation states that the net electric charge within an isolated system remains constant, as charges can neither be created nor destroyed, only redistributed or transferred.
Mechanical energy, which comprises kinetic and potential energy, may not be conserved in non-conservative systems, such as those experiencing dissipative forces like friction or air resistance. In these cases, some mechanical energy is lost as thermal energy or other forms of energy. Mass conservation is not always maintained at the subatomic level, particularly during processes like nuclear reactions, where mass can be converted into energy following Einstein's mass-energy equivalence principle, E=mc².
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a formic acid buffer solution contains 0.20 m h c o o h hcooh and 0.21 m h c o o − hcoox− . the pka of formic acid is 3.75. what is the ph of the buffer?
The pH of the buffer is 3.75. This is because the pKa of formic acid is 3.75, and the concentrations of the acid and its conjugate base in the buffer remain constant.
The pH of a buffer is determined by the concentrations of both the acid and its conjugate base. Since the pKa of formic acid is 3.75, this means the acid and its conjugate base must have concentrations of 0.20 M and 0.21 M respectively in order to keep the pH at 3.75. This is the case with the given buffer, therefore the pH is 3.75.
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3)how can you construct a model of a molecule based on a chemical formula?
Answer:
Chemical formula:
Chemical formulas give information regarding what atoms (and how many of them) make up a compound or ion. On their basis the molar mass of the chemical species is found.
Explanation:
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The first step of the aldol reaction, which you have just written, generates an enolate ion by removal of an acidic alpha-proton by the base catalyst H-ö- ethanal enolate Ethanal enolate is stabilized by additional resonance structure(s). (Enter an arabic number. 0, 1, 2, 3, etc.)
In the first step of the aldol reaction, an enolate ion is generated by the removal of an acidic alpha-proton by the base catalyst.
In the case of ethanal, this results in the formation of ethanal enolate. The ethanal enolate is stabilized by 1 additional resonance structure, which allows for the delocalization of electrons and contributes to its stability. The base catalyst, such as hydroxide ion or alkoxide ion, can remove the relatively acidic α-proton, generating the enolate ion. The enolate ion is a resonance-stabilized anion, which is a powerful nucleophile that can attack the electrophilic carbonyl carbon of another molecule. This nucleophilic attack is the second step of the aldol reaction, which results in the formation of a new carbon-carbon bond and the generation of a β-hydroxy carbonyl compound.
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What is the name for the speed of sound traveling through air?
A. echolocation
B. elasticity
C. mach 1
D. supersonic
A liquid compound gave a mass spectrum in which the molecular ion appears as a pair of equal intensity peaks at m/e = 122 & m/z = 124. Small fragment ion peaks are seen at m/z = 107 & 109 (equal intensity), and at m/z = 79, 80, 81, & 82 (all roughly the same size). Large fragment ions are seen at m/z = 43 (base peak), 41 & 39.
Based on the mass spectrum data provided, it can be inferred that the liquid compound contains a heavy isotope that contributes to the equal intensity peaks at m/e = 122 and m/z = 124.
The presence of small fragment ion peaks at m/z = 107 & 109, and at m/z = 79, 80, 81, & 82 suggest that the compound undergoes fragmentation during the mass spectrometry process, generating these specific ion patterns.
The base peak at m/z = 43, along with fragment ions at m/z = 41 & 39, further supports the compound's fragmentation pattern. The compound's molecular structure and composition can be deduced by analyzing these mass spectrum characteristics.
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Can you answer these questions?
1. The enthalpy of reactant is 80 KJ
2. The enthalpy of product is 160 KJ
3. The activaition energy for the reaction is 160 KJ
4. The heat of reaction is 80 KJ
5. The forward reaction is endothermic
6. The addition of catalyst will lower the activation energy
7. The enthalpy of reactant is less than the enthalpy of product
8. False
9. False
10. False
How do i determine the enthalpy of reactant and products?The enthalpy of reactants defines the energy of the reactants while the enthalpy of products defines the energy of product.
From the diagram given, we obtained the following
Enthalpy of reactants is 80 KJEnthalpy of products is 160 KJHow do i determine the activation energy?The activation energy for the reaction can be obtain as follow:
Energy of reactant = 80 KJPeak energy = 240 KJActivation energy = ?Activation energy = Peak energy - Energy of reactant
Activation energy = 240 - 80
Activation energy = 160 KJ
How do i determine the heat of reaction?The heat of reaction can be obtain as follow:
Enthalpy of reactants = 80 KJEnthalpy of products = 160 KJHeat of reaction = ?Heat of reaction = Enthalpy of products - Enthalpy of reactants
Heat of reaction = 160 - 80
Heat of reaction = 80 KJ
How do i know if the reaction is exothermic or endothermic?The heat of reaction obtained above is positive (i.e 80 KJ).
Thus, we can conclude that the forward reaction is endothermic reaction.
What happen when a catalyst is added?A catalyst is a substance which alters the rate of a reaction. Catalyst tends to lower the activation energy of a reaction, thereby enhacing the reaction rate.
However, we must take note of the following:
Addition of a catalyst does not change the heat of the reaction (ΔH)Addition of a catalyst does not change the enthalpy of reactantsAddition of a catalyst does not change the enthalpy of productsHow do i know if the enthalpy of reactants is less or greater?From the diagram above, we obtain:
Enthalpy of reactants = 80 KJEnthalpy of products = 160 KJWe can see that the enthalpy of the reactant is less than that of the products.
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what pressure would a gas mixture in a 10.0 l tank exert if it were composed of 48.5 g he and 94.6 g co 2 at 398 k? a.7.02 atm b.39.6 atm c.58.7 atm d.32.6 atm e.46.6 atm
The pressure exerted by the gas mixture composed of 48.5 g He and 94.6 g CO₂ is E. 46.6 atm.
To determine the pressure exerted by the gas mixture in the tank, we'll use the Ideal Gas Law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
First, we need to calculate the total number of moles (n) for both He and CO₂. We can do this using their molar masses: He = 4.00 g/mol and CO2 = 44.01 g/mol.
Moles of He = 48.5 g / 4.00 g/mol = 12.125 mol
Moles of CO₂ = 94.6 g / 44.01 g/mol = 2.149 mol
Total moles (n) = 12.125 mol + 2.149 mol = 14.274 mol
Now, we can use the Ideal Gas Law to find the pressure (P). We'll use the gas constant R = 0.0821 L·atm/mol·K and the given values for V (10.0 L) and T (398 K):
P = nRT / V
P = (14.274 mol)(0.0821 L·atm/mol·K)(398 K) / 10.0 L
P = 46.6 atm
So the pressure exerted by the gas mixture is 46.6 atm, which corresponds to option E.
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.electrons in a cyclic conjugated system. b.the compound is (a, aa, or na)fill in the blank ch3 ch3 o ch3
The pH of a solution depends on the concentration of hydrogen ions (H+) in the solution.
Acetic acid [tex](CH_{3} COOH)[/tex]is a weak acid, which means that it only partially dissociates in water, producing fewer H+ ions compared to a strong acid like hydrochloric acid (HCl).
Therefore, a 0.25 M solution of acetic acid will have a lower pH than a 0.25 M solution of hydrochloric acid, because the concentration of H+ ions in the acetic acid solution will be lower due to its weak acidic nature. The pH of the acetic acid solution will be slightly acidic, while the pH of the hydrochloric acid solution will be strongly acidic.
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Help me with these questions please!!
Complete the table to show the fraction of a radioisotope left after each half-life has passed:
Number of half-lives 0 1 2 3 4 5 6
Fraction remaining 1 1/2 1/4 1/8 1/16 1/32 1/64
Use the table above to help you answer the questions below:
a) After 5 half-lives, the fraction remaining is 1/32 or 0.03125. To find the percentage remaining, multiply by 100:
0.03125 x 100 = 3.125%
Therefore, after 5 half-lives, 3.125% of the sample will remain.
b) After 4 half-lives, the fraction remaining is 1/16 or 0.0625.
c) To find out how many half-lives it will take for 25% of a sample to remain, you can set up an equation:
[tex](1/2)^{(n)} = 0.25[/tex]
where n is the number of half-lives.
Taking the logarithm of both sides gives:
n x log(1/2) = log(0.25)
n = log(0.25) / log(1/2)
n = 2.
Therefore, it will take 2 half-lives for 25% of the sample to remain.
d) After 3 half-lives, the fraction remaining is 1/8 or 0.125. To find the percentage remaining, multiply by 100:
0.125 x 100 = 12.5%
Therefore, after 3 half-lives, 12.5% of the sample will remain.
e) The fraction remaining after 8 half-lives is [tex](1/2)^8[/tex], which simplifies to 1/256.
The half-life of iodine-131 is 10 days.
After 30 days, three half-lives have passed:
[tex](1/2)^3 = 1/8[/tex]
Therefore, after 30 days, 1/8 or 0.125 of the original mass will remain:
0.125 x 15g = 1.875g
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5.what is the purpose of adding the sulfuric acid? (hint: consider the products of the reaction and their properties)
The purpose of adding sulfuric acid in a reaction is to act as a catalyst and increase the rate of the reaction. Sulfuric acid also helps in protonating the reactants and forming intermediate compounds, which then react to produce the desired products.
Additionally, sulfuric acid can also remove water molecules from the reaction mixture, thereby shifting the equilibrium towards the formation of the desired products.
However, it is important to handle sulfuric acid with care as it is a strong acid and can cause burns and other hazards if not handled properly.
The purpose of adding sulfuric acid in a reaction is to act as a catalyst, which helps accelerate the reaction without being consumed itself. Sulfuric acid also serves as a strong dehydrating agent and can help generate specific products, such as esters or salts, depending on the reactants involved.
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draw the products formed when the ester is hydrolyzed with water and h2so4. define products by greater and lesser molecular weights.
a. The products formed when an ester is hydrolyzed with water and H₂SO₄ are an alcohol and a carboxylic acid.
b. The greater product is carboxylic acid and the lesser product is the original ester.
The alcohol formed has a lower molecular weight than the original ester, as it is missing the carboxylic acid group. The carboxylic acid formed has a greater molecular weight than the original ester, as it is now carrying an additional hydroxyl group. For example, if ethyl acetate is hydrolyzed with water and H₂SO₄, the products formed are ethanol and acetic acid. Ethanol has a lower molecular weight (46 g/mol) than ethyl acetate (88 g/mol), while acetic acid has a greater molecular weight (60 g/mol) than ethyl acetate.
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Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel.Will the aqueous layer be the upper layer or the lower layer?If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?
When extracting the aqueous salicylic acid solution with 10% ethyl acetate/hexane, the aqueous layer will be the lower layer.
If dichloromethane were substituted for the 10% ethyl acetate/hexane solution, the aqueous layer would still be the lower layer. This is because dichloromethane has a higher density than the 10% ethyl acetate/hexane solution, and therefore it will be the bottom layer in the separatory funnel.
Hi! In the extraction of aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml), the aqueous layer will be the lower layer because the density of the organic layer (ethyl acetate/hexane) is less than that of the aqueous layer (water).
If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, the aqueous layer would be the upper layer. This is because the density of dichloromethane is higher than that of the aqueous layer, causing it to sink below the aqueous layer.
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Which of the following is accurate in terms of the relationship between the velocity of a reaction and the rate constant of a reaction? Choose one: A. For a first-order reaction, the rate constant of a reaction is equal to the product of the substrate concentration and the velocity of the reaction. B. For both first-order and second-order reactions, the concentration of substrate is equal to the product of the velocity of the reaction and the rate constant of the reaction. C. In a first-order reaction, the rate constant of a reaction is equal to the velocity of the reaction divided by the concentration of substrate. D. In a second-order reaction, the rate constant is equal to the velocity of the reaction multiplied by the concentration of both substrates.
The accurate relationship between the velocity of a reaction and the rate constant of a reaction depends on the type of reaction. For a first-order reaction, the rate constant is proportional to the velocity of the reaction, and independent of substrate concentration. Therefore, option C is correct.
In a first-order reaction, the rate constant of a reaction is equal to the velocity of the reaction divided by the concentration of substrate. This means that as the concentration of substrate decreases, the velocity of the reaction will decrease as well, but the rate constant will remain constant. For second-order reactions, the rate constant is equal to the velocity of the reaction divided by the concentration of both substrates. It is important to note that the relationship between velocity and rate constant can differ depending on the order of the reaction. For both first-order and second-order reactions, the concentration of substrate affects the velocity of the reaction, but the rate constant is specific to the reaction type and independent of substrate concentration.
Options A and B are therefore incorrect. Option D is also incorrect, as it pertains to a second-order reaction with multiple substrates, which is not specified in the question.
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Draw the mechanism of the dehydration of alpha-terpineol to alpha-pinene. Include all the intermediates (A mechanism involves arrow pushing, writing -H+ or -H2O are not considered mechanistic steps).
The dehydration of alpha-terpineol to alpha-pinene is a complex reaction that involves several intermediates.
The first step is the protonation of the hydroxyl group in alpha-terpineol, which is catalyzed by an acid catalyst. This step generates a carbocation intermediate, which is stabilized by the adjacent double bond in the terpene structure.
The carbocation intermediate undergoes a series of rearrangements, leading to the formation of a more stable carbocation species. In the case of alpha-terpineol, the carbocation undergoes a 1,2-methyl shift, resulting in the formation of a secondary carbocation. This carbocation then undergoes a second 1,2-methyl shift, leading to the formation of a tertiary carbocation.
The final step in the mechanism is the elimination of a proton from the tertiary carbocation, resulting in the formation of alpha-pinene. This reaction is facilitated by a base catalyst, which removes the proton and promotes the elimination of a molecule of water.
Overall, the mechanism of the dehydration of alpha-terpineol to alpha-pinene is a multistep process that involves the formation of several intermediates. The reaction requires the presence of both an acid and a base catalyst to facilitate the protonation and deprotonation steps.
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what is the ph of a 0.114 m monoprotic acid whose ka is 1.258 × 10−3?
The pH of a 0.114 M monoprotic acid with a Ka of [tex]1.258 * 10^{-3[/tex]is 2.54.
To find the pH of a 0.114 M monoprotic acid with a Ka of [tex]1.258 * 10^{-3[/tex], we need to use the equation for calculating the pH of a weak acid:
pH = pKa + log([A-]/[HA])
First, we need to find the pKa, which can be calculated using the Ka value:
[tex]pKa = -log(Ka) = -log(1.258 * 10^{-3}) = 2.9[/tex]
Now we can plug in the values for pKa and the concentration of the acid (0.114 M) into the pH equation:
pH = 2.9 + log([A-]/[HA])
Since the acid is monoprotic, [A-] is equal to the concentration of the conjugate base (which is formed when the acid donates a proton), and [HA] is equal to the concentration of the undissociated acid. We can assume that the concentration of the conjugate base is very small compared to the concentration of the acid, so we can simplify the equation to:
[tex]pH = 2.9 + log([A^-]/0.114)[/tex]
We can solve for [A-] using the expression for the dissociation constant:
[tex]Ka = [A^-][H^+]/[HA][/tex]
[tex]1.258 * 10^{-3} = [A^-]^2 / (0.114 - [A^-])[/tex]
Simplifying this equation gives us a quadratic equation:
[tex][A^-]^2 + 1.258 * 10^{-3} [A^-] - 1.258 * 10^{-3 }* 0.114 = 0[/tex]
Solving this equation using the quadratic formula gives us:
[tex][A^-] = 0.0508 M[/tex]
Now we can plug in the values for pKa and [A-] into the pH equation:
pH = 2.9 + log(0.0508/0.114) = 2.54
Therefore, the pH of a 0.114 M monoprotic acid with a Ka of [tex]1.258 * 10^{-3[/tex]is 2.54.
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A mixture of He and O2 gas is confined to a 3.50 L container at 32 oC. The He exerts a pressure of 1.25 atm and the O2 exerts a pressure of 2.12 atm. What is the mole fraction (X) of the He?
15.1
0.591
0.629
0.371
1.69
Since He exerts a pressure of 1.25 atm and the O₂ exerts a pressure of 2.12 atm, the mole fraction (X) of the He is 0.371.
To find the mole fraction (X) of He in the mixture, you can use Dalton's Law of partial pressures. First, calculate the total pressure (P_total) by adding the pressures exerted by He and O2:
P_total = P_He + P_O2
P_total = 1.25 atm + 2.12 atm
P_total = 3.37 atm
Next, calculate the mole fraction (X_He) of He by dividing the pressure exerted by He (P_He) by the total pressure (P_total):
X_He = P_He / P_total
X_He = 1.25 atm / 3.37 atm
X_He ≈ 0.371
Therefore, the mole fraction of He in the mixture is approximately 0.371.
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explain briefly why the relative affinity of heme for oxygen and carbon monoxide is changed by the presence of the myoglobin protein.
The presence of the myoglobin protein changes the relative affinity of heme for oxygen and carbon monoxide by inducing conformational changes in the binding site.
What factors affect the affinity of heme for [tex]O_{2}[/tex] and CO?The relative affinity of heme for oxygen ([tex]O_{2}[/tex]) and carbon monoxide (CO) is significantly altered by the presence of myoglobin. Myoglobin is a protein that binds to oxygen and facilitates its transport in muscles. The presence of myoglobin changes the binding preferences of the heme group, which is the oxygen-binding component of the protein.
In the absence of myoglobin, the heme group has a higher affinity for CO, which can competitively inhibit oxygen binding. However, when myoglobin is present, the binding site of the heme group undergoes conformational changes. This change in structure reduces the affinity of heme for CO while increasing its affinity for oxygen.
These alterations in the binding site are crucial for the proper functioning of myoglobin. The increased affinity for oxygen allows myoglobin to efficiently transport and store oxygen in muscle tissues, while the decreased affinity for CO prevents the potentially harmful effects of CO binding.
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what is the mole fraction of k2s in a solution that is 18y mass k2s?
the mole fraction of K_2s in a solution that is 18% mass K_2s is 0.0228 or 2.28%.
To find the mole fraction of K_2s in a solution that is 18% mass K_2s, we need to first convert the mass percentage to mole fraction.
Let's assume we have 100 grams of the solution. Since it is 18% mass K_2s, we have 18 grams of K_2s.
To find the moles of K_2s, we need to divide the mass by the molar mass. The molar mass of K_2s is 174.27 g/mol.
So, moles of K_2s = 18 g / 174.27 g/mol = 0.1034 mol
Now, let's find the moles of the solvent (assuming it is water) using the total mass of the solution.
Moles of solvent = (100 g - 18 g) / 18.02 g/mol = 4.436 mol
The total moles of solute and solvent in the solution is:
Total moles = moles of K_2s + moles of solvent = 0.1034 mol + 4.436 mol = 4.5394 mol
Finally, we can find the mole fraction of K_2s:
Mole fraction of K_2s = moles of K_2s / total moles = 0.1034 mol / 4.5394 mol = 0.0228 or 2.28% (rounded to two decimal places)
Therefore, the mole fraction of K_2s in a solution that is 18% mass K_2s is 0.0228 or 2.28%.
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an atom gi has a heavier isotope. the heavier isotope has 42 neutrons- it has new 2 neutrons more than the regular atom. gi 2 has 40 electrons. what is the atomic mass of this atom?
The atomic mass of an atom is the sum of protons and neutrons. So, the atomic mass of this heavier isotope of atom gi is: 82 atomic mass units (amu).
we know that the heavier isotope of the atom gi has 42 neutrons, which is 2 more than the regular atom. This means that the regular atom has 40 neutrons.
The number of electrons in gi 2 is also given as 40. Since atoms are neutral and have the same number of electrons and protons, we can infer that the number of protons in gi 2 is also 40.
To find the atomic mass of gi 2, we need to add the number of protons and neutrons together.
Atomic mass = number of protons + number of neutrons
Atomic mass of gi 2 = 40 protons + 42 neutrons
Atomic mass of gi 2 = 82
Therefore, the atomic mass of gi 2 is 82.
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describe in words the surface whose equation is given rho^2 -3rho 2 = 0
The surface described by the equation ρ² - 3ρ cos(φ) = 0 is a cone with its vertex at the origin and its axis along the z-axis.
The equation given is in cylindrical coordinates where ρ is the radial distance from the origin, φ is the angle made by the radius vector with the x-axis, and z is the vertical coordinate. To visualize this surface, we can rewrite the equation as ρ(ρ-3cos(φ))=0, which means either ρ=0 or ρ=3cos(φ).
When ρ=0, we get a point at the origin. When ρ=3cos(φ), we get a cone with its vertex at the origin and its axis along the z-axis. To see this, we can rewrite ρ=3cos(φ) as z=ρcos(φ)=3cos²(φ), which is the equation of a double-napped cone with its vertex at the origin and its axis along the z-axis.
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calculate [oh-] at 25°c for a solution having ph = 5.65
The [OH⁻] at 25°C for a solution having a pH of 5.65 is 4.47 × 10⁻⁹ M.
To calculate the [OH⁻] at 25°C for a solution having a pH of 5.65, you can use the following relationship:
pH + pOH = 14
First, you need to determine the pOH:
pOH = 14 - pH
= 14 - 5.65
= 8.35
Next, use the relationship between pOH and [OH⁻]:
pOH = -log10[OH⁻]
Now, solve for [OH⁻]:
[OH⁻] = 10^(-pOH) = 10^(-8.35)
≈ 4.47 × 10⁻⁹ M
So, the concentration of hydroxide ions [OH⁻] in the solution at 25°C with a pH of 5.65 is approximately 4.47 × 10⁻⁹ M.
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HELP NOW PLEASE..QUESTION IS IN PICTURE
Answer: The image shows a quadratic function with a minimum point at (2, -2) and passing through the y-axis at (0, 1). The coefficient "a" is positive, which means that the parabola opens upward.
Explanation:
calculate δs∘ values for the following reactions by using tabulated s∘ values from appendix c in the textbook. 2fe2o3(s)→4fe(s) 3o2(g)
The δs∘ value for the reaction [tex]2Fe2O3(s) → 4Fe(s) + 3O2(g) is -824.2 J/K.[/tex]
The δs∘ value can be calculated using the standard entropy values (s∘) of the reactants and products. In this case, the s∘ values for Fe2O3(s), Fe(s), and O2(g) can be found in Appendix C of the textbook.
The δs∘ value for the reaction is calculated using the formula:
[tex]δs∘ (reaction) = Σnδs∘ (products) - Σmδs∘[/tex] (reactants)
where n and m are the stoichiometric coefficients of the products and reactants, respectively.
Plugging in the s∘ values and solving the equation gives a δs∘ value of -824.2 J/K for the given reaction.
This negative δs∘ value indicates that the reaction is spontaneous at low temperatures and/or under standard conditions. The greater the absolute value of δs∘, the greater the spontaneity of the reaction.
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if the complete combustion of an unknown mass of ethylene produces 58.0 g co2, what mass of ethylene is combusted? combustion of ethylene: c2h4 (g) 3 o2 (g) -> 2 co2 (g) 2 h2o (g)
18.5 g of ethylene is combusted if the complete combustion of an unknown mass of ethylene produces 58.0 g co2.
The balanced chemical equation for the combustion of ethylene is:
C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (g)
According to the equation, for every 2 moles of CO2 produced, 1 mole of C2H4 is consumed. We can use this relationship to calculate the mass of ethylene combusted if we know the mass of CO2 produced.
The molar mass of CO2 is 44.01 g/mol. The given mass of CO2 produced is 58.0 g. Therefore, the number of moles of CO2 produced is:
58.0 g / 44.01 g/mol = 1.318 mol
Since 2 moles of CO2 are produced for every mole of C2H4 consumed, the number of moles of C2H4 consumed is:
1.318 mol CO2 × (1 mol C2H4 / 2 mol CO2) = 0.659 mol C2H4
The molar mass of C2H4 is 28.05 g/mol. Therefore, the mass of C2H4 combusted is:
0.659 mol C2H4 × 28.05 g/mol = 18.5 g
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A student is given the following information about an unknown solution: Dissociates 100%
Feels slippery to the touch
pH 13.5
a. Strong acid
b. Atrong base
c. Weak acid
d. Weak base
Methane and chlorine do not react with strong bases like NaOH when heated above 100°C or made extremely weakly acidic. By giving thorough methods for resolving chemical problems, it seeks to aid students in developing their analytical and problem-solving abilities. Hence (c) is the correct option.
It is discovered that ideal gas calculations can provide a reliable estimate of the loss in mass flow caused by swirl even when applied to real gases. None of these structural MRI abnormalities, nevertheless, appear to be diagnostically significant for CBD. It offers expert recommendations and discusses the real-world applications of the fundamental scientific concepts covered in Volume I.
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Consider an electrochemical cell with the following half-cells:
Pb2+(aq,0.01M)|Pb(s) and Sn2+(aq,2.0M)|Sn(s)
At 25 ∘C. All of the following questions assume you have written the reaction as:
Pb2+(aq)+Sn(s)⟶Sn2+(aq)+Pb(s)Pb2+(aq)+Sn(s)⟶Sn2+(aq)+Pb(s) (even though the nonstandard cell operates in the opposite direction). What is [Sn2+] when the system reaches equilibrium?
At equilibrium, the concentrations of both products and reactants remain constant, so the [Sn²⁺] will remain 2.0 M.
The reaction is driven by the difference in concentrations between the two half-cells and the reduction potential of the reaction. Since the Pb⁺² concentration is much lower in the left cell, the reaction is driven to the right, where the Sn²⁺ concentration is higher.
This reaction will continue until both sides have equal concentrations, at which point the reaction will reach equilibrium. Since the [Sn²⁺] is higher in the right cell, it will remain at 2.0 M at equilibrium. This is because the reaction is driven by the difference in concentrations and not the absolute value of the concentrations.
Thus, [Sn²⁺] will remain at 2.0 M when the system reaches equilibrium.
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The addition of 100 g of a compound to 750 g of CCl4 lowered the freezing point of the solvent by 10.5K. Calculate the molar mass of the compound. (Given Answer: 3.8*10^2 g/mol).
Related equations: Raoult's law or Henry's law.
The molar mass of the compound added to a compound of CCl₄ lowering the freezing point of the solvent by 10.5K is approximately 141.69 g/mol.
To calculate the molar mass of the compound, we'll use the formula for freezing point depression:
ΔTf = Kf * m
where ΔTf is the change in freezing point (10.5K), Kf is the cryoscopic constant of CCl₄ (5.03 K kg/mol), and m is the molality of the solution.
First, we need to find the molality of the solution:
molality = moles of solute / kg of solvent
moles of solute = (mass of solute) / (molar mass of solute)
We need to find the molar mass of the solute, which we'll call "M":
molality = (100 g / M) / (750 g / 1000 g/kg)
Now, we can plug in the values for ΔTf and Kf:
10.5 K = (5.03 K kg/mol) * (100 g / M) / (750 g / 1000 g/kg)
Solve for "M":
M = (100 g / 750 g / 1000 g/kg) * (5.03 K kg/mol) / 10.5 K
M ≈ 141.69 g/mol
The molar mass of the compound is approximately 141.69 g/mol.
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for each of the following pairs of species, determine which is the better reducing agent under standard conditions:A) Cu or B) AgC) Fe2+ or D) CrE) I− or F) H2 (in acidic soln)G) O2 or H) H2O2 (in acidic soln)I) Sn2+ or J) Fe2+
To determine the better reducing agent for each pair under standard conditions standard reduction potential of each is to be identified.
Fe2+ (E° = -0.44 V).
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the ph at one half the equivalence point in an acid-base titration was found to be 5.77. what is the value of ka for this unknown acid?
In order to determine the value of Ka for the unknown acid, we can use the given information about the pH at half the equivalence point in an acid-base titration. At half the equivalence point, the concentration of the weak acid ([HA]) and its conjugate base ([A-]) are equal.
At one half the equivalence point in an acid-base titration, the concentration of the acid is equal to the concentration of the conjugate base, and the pH is equal to the pKa of the acid. Therefore, we can write:
pH = pKa
Given that the pH is 5.77, we can substitute this value into the equation:
5.77 = pKa
Now, we can solve for pKa by taking the antilogarithm of both sides to get rid of the logarithm:
[tex]10^{5.77} = 10^{pka}[/tex]
pKa = 5.77
So, the value of pKa for the unknown acid is 5.77. Please note that pKa and Ka are related by the equation Ka = 10^(-pKa), so we can calculate Ka as:
[tex]Ka = 10^{-5.77}[/tex]
Using a calculator, we get:
[tex]Ka \approx 1.95 *10^{-6}[/tex]
So, the value of Ka for the unknown acid is approximately 1.95 × 10^(-6).
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a compound is found to contain 1.245 nickel and 5.381 g iodine. it's empircal formula is
The empirical formula of the compound containing 1.245g Ni and 5.381g of iodine is NiI₂.
To determine the empirical formula of the compound, we need to find the ratio of the atoms present in the compound.
Step 1: Convert the given masses of nickel and iodine to moles using their respective atomic masses.
Molar mass of nickel (Ni) = 58.69 g/mol
Molar mass of iodine (I) = 126.90 g/mol
Number of moles of Ni = 1.245 g / 58.69 g/mol = 0.0212 mol
Number of moles of I = 5.381 g / 126.90 g/mol = 0.0424 mol
Step 2: Find the smallest mole value, which in this case is 0.0212 mol of Ni.
Step 3: Divide both mole values by the smallest mole value to get the simplest whole number ratio of atoms.
0.0212 mol Ni / 0.0212 mol = 1
0.0424 mol I / 0.0212 mol = 2
So, the empirical formula of the compound is NiI₂.
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