Chemistry High School

Convert 15.75 grams of Magnesium to atoms.

Answers

Answer 1

Answer: [tex]3.903\times 10^{23}[/tex]

Explanation:

Given

Mass of magnesium is [tex]m=15.75\ gm[/tex]

The molar mass of magnesium [tex]M=24.3\ g/mol[/tex]

No of moles in 15.75 g of magnesium is

[tex]\Rightarrow n=\dfrac{15.75}{24.3}\\\\\Rightarrow n=0.648\ \text{moles}[/tex]

1 mole contains [tex]6.022\times 10^{23}[/tex] atoms

So, 0.648 moles contain [tex]0.648\times 6.022\times 10^{23}[/tex]

[tex]=3.903\times 10^{23}\ \text{atoms}[/tex]

Related Questions

The area of a circle is 38.5 cm². Calculate.
(a) the radius

Answers

The Answer is 3.501591994

Explanation:

area of circle = πr^2

radius=

39.5 = 22/7*r^2

r^2 = 7*39.5/22

= 12.56

r=3.5

1
According to the text, what is reduction?

Answers

you forgot to attach the text

BTW reduction is the action or fact of making a specified thing smaller or less in amount, degree, or size.

Why did the discovery of electrons mean that an atom must contain some positive charge?

WARNING!!!!!!!!!: NO LINKS OR I WILL REPORT YOU!!!!!

Answers

Answer

electrons are very small, so every atom would have to contain a whole lot of electrons.Atoms must also contain some type of positively charged material which balances the negative charge on the electrons.

Explanation:

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

hope this helped

States of Matter Escape Room

Matter is defined as anything that has

A. Phase changes and mass
B. Atoms and density
C. Color and weight
D. Volume and mass

Answers

Answer:

Explanation:

matter has mass and undergoes a phase change

What is the function of the system shown in the diagram?
O A. removal of wastes
OB. absorption of nutrients into the bloodstream
O C. carrying oxygenated blood and nutrients to cells
O D. transmitting and receiving messages

Answers

Answer:

the answer is carrying oxygenated blood and nutrients to cells

in which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

Answers

Answer:

G - H2SO4

Explanation:

two hydrogen atoms and 4 oxygen atoms

25) In a certain area where there are many farms, the groundwater levels have dropped by as much as 10 m over a period of 30 years. The main cause behind this is MOST LIKELY

A) the evaporation of water from aquifers.

B) the excessive pumping of water through wells.

C) the leakage of fertilizers from the farms into the aquifer.

D) the construction of a dam to divert water into a reservoir.
NO LINKS!!!
I will give Brainliest to 1st right answer!

Answers

Answer:

I a, answering so the other dude can get brainily oh and yeah its b

Explanation:

The excessive pumping of water through well is the major reason for the drop of ground water level. The nearby farms over use water and pumps from undergrounds.

What is underground water?

Water beneath the earth surface is called ground water. The storage of ground water is a very important in all areas to sustain our need for water and it must be maintained pure without the presence of overdose of heavy metals and other impurities.

Reduction in the level of ground water storage is a serious issue that might leads to a scenario where the drinking water is not sufficient. The uncontrolled use of pump water by factories, industries and farms results in the drop of ground water level.

The nearby farms might pumping water from sources uncontrollably in the area. That is the main reason of dropping in ground water level. Hence, option B is correct.

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Which organelle stores the information that determines an individual blood type

Answers

Answer:organelle 1

Explanation:

Organulo 1 is the organelle that stores the information that determines an individual blood type. The correct option is option A.

What is organelle?

A tiny cellular component known as an organelle serves a specialised purpose within a cell. The cytoplasm of prokaryotic and eukaryotic cells contains organelles. Organelles are frequently encased by a separate membrane in eukaryotic cells because they are more complicated.

Similar to the internal organs of the body, organelles are specialised and carry out important tasks required for proper cellular function. Organelles are responsible for a variety of tasks, such as powering a cell's energy needs and regulating its development and reproduction. Organulo 1 is the organelle that stores the information that determines an individual blood type.

Therefore, Organulo 1 is the organelle that stores the information that determines an individual blood type. The correct option is option A.

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Your question is incomplete but most probably your full question was,

14. As the moles of salt added are increased, what
happens to the melting point of the water?

Answers

Salt lowers the freezing/melting point of water, so in both cases the idea is to take advantage of the lower melting point. Ice forms when the temperature of water reaches 32 degrees Fahrenheit (0 degrees Celsius).

Salt increases the boiling point and decreases the melting point of water. That means if you add salt before heating some water on the stove, it will take longer to boil. Also, if you add salt to ice, it will melt faster.

What is the melting point?

Melting point is the temperature at which a given solid material changes from a solid state to a liquid, or melts.

Salt makes water boil at a higher temperature - water sticks to the salt ions, so they can't get out of the liquid as easily.

Salt makes water freeze at a lower temperature - it's probably harder for the water molecules to get organized into a solid-state with all the salt ions messing up its structure.

Hence, as the moles of salt are added melting point of the water increases.

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R is the ideal gas constant. We know it is equal to 0.0821. What is the unit for R?
L•atm/mol K
L•atm/mol · °C
mL • atm/mol. K
L• kPa/mol - K

Answers

Answer:

A. L•atm/mol K

Explanation:

The ideal gas law equation is given as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant

T = temperature (K)

As rightly stated in this question, R is the ideal gas constant, which can be different depending on the unit of the other components.

At STP;

V = 22.4L

P = 1 atm

T = 273 K

n = 1 mole

Hence, using PV = nRT

R = PV/nT

R = 1 × 22.4/1 × 273

R = 22.4/273

R = 0.08205

Approximately, R = 0.0821

With the units of P as atm, V as L, n as mol and T as K; R will be 0.0821 L•atm/mol K

What happens when light passes through a solution? perform an activity with a homogenous to expalin what happen when light pass through it.

Answer fast and pls read the question ;-; and will give u brainliest

Answers

Answer:

light bends and makes effects in the water

Explanation:

Is a hydrogel a smart polymer/stimuli-responsive polmer?

Answers

Polymer scientists have been trying to mimic this behavior by creating so called smart polymers. ... One of the most important classes of stimuli-responsive polymers used for controlled drug delivery is crosslinked polymer networks, e.g., hydrogels and microgels.
Hopefully this helps if not I’ll try rewriting it

Answer:

Explanation:

The reaction a(g)⇌b(g) has an equilibrium constant of 5.8 and under certain conditions has q = 336. part a what can you conclude about the sign of δg∘rxn and δgrxn for this reaction under these conditions?

Answers

Answer:

The answer is "As [tex]Q=336[/tex], at high-temperature [tex]\Delta G_{rxn}>0[/tex] and When[tex]K>1,[/tex][tex]\Delta G^{\circ}_{rxn}>0[/tex]."

Explanation:

The equation for the reaction is:

[tex]A(g) \leftrightharpoons B(g)[/tex]

[tex]K=5.8\\\\Q=336[/tex]

At equilibrium,

[tex]\Delta G^{\circ}_{rxn}>0[/tex][tex]=-RT \ln \ K[/tex]

When k=5.8(>1), the value of [tex]\ln k[/tex] would be positive

So, [tex]\Delta G^{\circ}_{rxn}[/tex] is negative (< 0)

So if K > l, [tex]\Delta G^{\circ}_{rxn}<0[/tex]

If the reaction is not in equilibrium so the equation is :

[tex]\Delta G_{rxn}>0[/tex]=[tex]\Delta G^{\circ}_{rxn}[/tex][tex]+RT \ln Q[/tex]

Substituting the expression:

[tex]\Delta G_{rxn}>0[/tex][tex]= (-RT \ln K) + RT \ln Q[/tex]

[tex]= RT(\ln Q- \ln K)\\= RT(\ln (336)-\ln (5.8))\\= RT(4.06)[/tex]

It is the positive value for all temperatures.

So, As Q = 336, at the high temperature [tex]\Delta G_{rxn}>0[/tex].

which of the following is true about these diagrams

Answers

Answer:

N/A NO DIAGRAM

Explanation:

N/A NO DIAGRAM

N/A NO DIAGRAM N/A NO DIAGRAM

N/A NO DIAGRAM

N/A NO DIAGRAM N/A NO DIAGRAM

N/A NO DIAGRAM

Please someone help ! I need it ASAP

Answers

Answer:

6.B

7.B

Explanation:

Mark me as brainliest

6b
7b
Are the correct answers

according to the periodic table, which two elements have an atomic mass less than twice their atomic number?

Answers

Answer:

Hydrogen and Oxygen

Explanation:

Hydrogen atomic mass = 1.008 amu

atomic mass = 15.999 amu

According to the periodic table, two elements whose atomic mass is less than twice their atomic number are hydrogen and oxygen.

The atomic number of an atom refers to the number of protons in that atom. It serves as an identity for atoms of elements. The atomic mass of element is the weighted average of the masses of all the isotopes of the element.

The atomic number of oxygen is 8 while the atomic number of hydrogen is 1. The atomic mass of oxygen is 15.999 amu while the atomic mass of hydrogen is 1.0008 amu.

We can see that twice the atomic number of oxygen gives sixteen while twice the atomic number of hydrogen gives two. Therefore, two elements whose atomic mass is less than twice their atomic number are hydrogen and oxygen.

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The wording of these questions are confusing how would you set this up ?

The formula is m1v1=m2v2

Answers

Answer:

8. 171074.8 mL

9. 3475 mL.

Explanation:

8. Determination of the volume of the diluted solution.

Initial Molarity (M₁) = 14 M

Initial volume (V₁) = 523 mL

Final Molarity (M₂) = 0.0428 M

Final volume (V₂) =?

Using the dilution formula, we can obtain the volume of the diluted solution as follow:

M₁V₁ = M₂V₂

14 × 523 = 0.0428 × V₂

7322 = 0.0428 × V₂

Divide both side by 0.0428

V₂ = 7322 / 0.0428

V₂ = 171074.8 mL

Therefore, the volume of the diluted solution is 171074.8 mL

9. Determination of the volume of water added.

We'll begin by calculating the final volume of the solution. This can be obtained as follow:

Initial Molarity (M₁) = 3.2 M

Initial volume (V₁) = 973 mL

Final Molarity (M₂) = 0.7 M

Final volume (V₂) =?

M₁V₁ = M₂V₂

3.2 × 973 = 0.7 × V₂

3113.6 = 0.7 × V₂

Divide both side by 0.7

V₂ = 3113.6 / 0.7

V₂ = 4448 mL

Thus, the final volume of the solution is 4448 mL

Finally, we shall determine the volume of water added. This can be obtained as follow:

Initial volume (V₁) = 973 mL

Final volume (V₂) = 4448 mL

Volume of water added =?

Volume of water added = V₂ – V₁

Volume of water added = 4448 – 973

Volume of water added = 3475 mL

one example of potential energy.

Answers

Answer:

a raised weight

water that is behind the dam

a car that is parked at the top of a hill

a you before it released

a ripe fruit before It falls

why would a farmer add calcium hydroxide to his soil

Answers

Increase the growth

What must be known to find an object's average speed?
*direction and time
*distance and time
*displacement and direction

Answers

Answer:

distance and time

Explanation:

total distance/ total time

Hydrocarbons separated by fractional distillation of petroleum can be cracked to make
useful shorter chain products.
Which substance is not a product of the cracking of propane, M, 44?
A C.Hg
B C2H4
C C3H6
DH2
Q Zoom image
Answer:
{ x R X
Daraaranh
a
o
זחו

Answers

Answer:

c.hg cannot be cracked for fractional distillation as there is only one of each

Explanation:

The Centers for Disease Control and Prevention (CDC) recommends that public health actions be initiated when the level of lead in a child’s blood is 5 micrograms per deciliter (µg/dL) or more. What is this in ppm? ( 1 dL = 0.1 dm^3)

a) 5 ppm
b) 0.5 ppm
c) 50 ppm
d) 0.05 ppm

Answers

c is the best for this

What are the 2 common uses for Copper?

Answers

for electrical equipment such as wiring and motors. also for construction exm. roofing and plumbing, and industrial machinery

Copper's most common use is in electrical equipment such as wiring and motors. Copper is also used in roofing, guttering, plumbing, cookware and cooking utensils.

Neptune is 30 AU (astronomical units) from the sun. How long, in light minutes, would it take for light from the sun to reach Neptune?

Answers

Answer:

250 light minutes takes

Explanation:

1 astonomical unit is equal to 1.50x10¹¹m

The light travels at the speed of 3.0x10⁸m/s. That means in 1 second, travels 3.0x10⁸m. To solve this question we must find the distance of neptune to the sun in meters. In this way we can find the seconds (And minutes) that need the light to travel from the sun to neptune:

Distance from Sun to neptune:

30AU * (1.50x10¹¹m / 1AU) = 4.5x10¹²m

Time transcurred:

4.5x10¹²m * (1s / 3.0x10⁸m) = 15000s

15000s * (1min / 60s) =

250 light minutes takes

If 164.8 g of iodine monobromide is combined with 62.4 g of ammonia, determine the amount of excess reactant that remains after the reaction is completed and the percentage yield of nitrogen triiodide if 96.4 is produced?

Answers

Answer:

[tex]m_{NH_3}^{leftover}=57.88g[/tex]

[tex]Y= 92.0\%[/tex]

Explanation:

Hello there!

In this case, according to the following chemical reaction between iodine monobromide and ammonia:

[tex]3IBr+NH_3\rightarrow NI_3+3HBr[/tex]

It turns out firstly necessary to identify the limiting reactant, by considering the proper molar masses and the 3:1 and 1:1 mole ratios of iodine monobromide to nitrogen triiodide and ammonia to nitrogen triiodide respectively:

[tex]n_{NI_3}^{by\ IBr}=164.8gIBr*\frac{1molIBr}{206.81gIBr}*\frac{1molNI_3}{3molIBr} =0.266molNI_3\\\\n_{NI_3}^{by\ NH_3}=62.4gNH_3*\frac{1molNH_3}{17.03gNH_3}*\frac{1molNI_3}{1molNH_3} =3.66molNI_3[/tex]

Thus, we conclude that the limiting reactant is IBr as is yields the fewest moles of nitrogen triiodide product. Next, we can calculate the reacted grams of ammonia as the excess reactant:

[tex]m_{NH_3}^{reacted}=0.266molNI_3*\frac{1molNH_3}{1molNI_3}*\frac{17.03gNH_3}{1molNH_3}=4.52gNH_3[/tex]

And therefore the leftover of ammonia is:

[tex]m_{NH_3}^{leftover}=62.4g-4.52g=57.88g[/tex]

Next, the percent yield is calculated by firstly calculating the theoretical yield of nitrogen triiodide as follows:

[tex]m_{NI_3}^{theoretical}=0.266molNI_3*\frac{394.72gNI_3}{1molNI_3} =104.8gNI_3[/tex]

And finally the percent yield by dividing the given actual yield of 96.4 g by the previously computed theoretical yield:

[tex]Y=\frac{96.4g}{104.8g}*100\%\\\\Y= 92.0\%[/tex]

Best regards!

What reactants form a combustion reaction?

Answers

Answer:

Hydrocarbon and oxygen

Explanation:

"a substance reacts with oxygen gas, it must involve O² as one of the reactants."

Using this, we can confirm Hydrocarbon and oxygen is a valid one.

What is the molarity of 5.60 mol of sodium carbonate in 1500 ml of solution?

Answers

Answer:

3.74 M

Explanation:

We know that molarity is moles divided by liters. The first thing to do here is convert your 1500 mL of solution to L. There's 1,000 mL in 1 L, so you need to divide 1500 by 1000:

1500 ÷ 1000 = 1.50

Now you can plug your values into the equation for molarity:

5.60 mol ÷ 1.50 L = 3.74 M

do earths plates meet at boundaries

Answers

Answer:

Earth's plates meet at BOUNDARIES. Breaks in the crust called FAULTS form where plates meet. ... Most TRANSFORM BOUNDARIES where plates move apart occur along the mid-ocean ridges.

Explanation:

i hope this helped you ;)

Como se explica o fato de o diamante e o grafite serem formados pelo mesmo elemento, o carbono, e serem materiais completamente diferentes?

Answers

Answer:

Ver explicacion

Explanation:

La capacidad de un elemento de existir en diferentes formas en el mismo estado físico se conoce como alotropía.

No es solo el carbono el que exhibe alotropía. También se sabe que el azufre y el fósforo exhiben alotropía.

Hay dos alótropos cristalinos de azufre; grafito y diamante. El grafito y el diamante difieren en la disposición de los átomos de carbono y la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.

Por lo tanto, el grafito y el diamante tienen propiedades físicas y químicas observadas completamente diferentes debido a las diferencias en la disposición de los átomos de carbono en cada sustancia, así como a las diferencias en la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.

Balance the following reaction:
C2H6(g) + O2(g) → CO2(g) + H2O(g)

Answers

2 C2H6(g)+ 7 O2(g)-> 4 CO2(g) + 6 H2O(g)

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is

2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)

What is Balanced equation?

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

C[tex]_2[/tex]H[tex]_6[/tex](g) + O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + H[tex]_2[/tex]O(g)

Multiply by 7 on reactant side and by 6 on product side to balance oxygen

C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)

Now balance carbon and hydrogen

2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)

Therefore, the balanced equation is

2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)

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please help!The solutions of the equation -x2 +1 = 0 areand x = Tina and Kylie saw an ad on television comparing different brands ofpaper towels. They decided to run their own experiment to seewhich towel could absorb the most liquid. They took several brandsof paper towels and cut them into equal sized strips. They put thestrips in small containers. Next they poured water into eachcontainer. After 2 minutes, they pulled the strips out and measuredhow much water was left. What was one variable they forgot tocontrol? When did the mass murder of Jewish people at Auschwitz begin? Micheal is using the table below to find the value of 128 x 72 .Thank you to anyone who answers . hello please help ill give brainliest thanks :) give me at least five main characteristic of irrigation equipment Which of the following kingdoms includes organisms that are single-celled eukaryotes that can be either heterotrophic or autotrophic? Plantae B Fungi C Protista D Animalia Complete the sentences with the present simple or present continuous form of the verbs in brackets.Please help! Does the sun rotate on an axis? Explain your answer using evidence from the video. plz help immediately plz(Choose the correct form of the verb.)1. Los fines de semana, a Mara te gusta / le gusta 'estudiar.2. Andrs y yo, nos encanta/les encanta escuchar msica.3. (yo) Te gusta/Me gusta salir con mis amigos cada sbado4. (ellos) les encantan/les encanta dar un paseo por el parque.5. El hermano de Roberto dice que le gusta/te gusta jugar videojuegos.6. A Lucia le encanta/les encantan ir al polideportivo.7. (t) Te gusta/Me gusta tocar la guitarra?8. No me gusta/me gustan andar en patineta.9. (nosotros) No nos gusta/nos gustan hablar por telfono.10. (ellos) No les encantan/les encanta asistir a la misa los domingos. The auditor begins selecting controls to test by _______. by understanding the entity and the business and determining the risk of material fraud or error at the financial statement level by understanding the entity and all other industries and determining the risk of material fraud or error at the financial statement level asking management which controls they would prefer the auditor to test checking the same controls as the prior year A wave has a wavelength of 4 m and a frequency of 85 Hz. What is the speed of this wave? A data set is normally distributed with a mean of 25 and a standard deviation of 1.Using the Empirical Rule, what percent of the data is greater than 26?Group of answer choices34%16%13.5%23% Help fast pls. I will surely mark you brainliest. Answer step by stepSohail, Amar, raja, and Mira go to a restaurant to have diner, Sohail pays 1/5 of the bills, Amar pays 2/5 of it and the balance is shared equally between raja and Mira. Who pays the maximum amount? The local grocery store sells a gallon of milk for 2.94 if my family drinks 1.5 gallon of milk every week how much will they spend on milk for 4 weeks Find the area of this shape * Why does the golf ball sink inwater, while the beach ballfloats?A- The beach ball weighs less thanthe golf ballB- The golf ball has a higher densitythan the beach ballC- The beach ball has a higherdensity than the golf ballD- The golf ball has more mass thanthe beach ball Jessica bought 5 gallons of orange juice. The cost of 1 quart of orange juice is $2. How much, in dollars, did Jessica spend on orange juice? Arianna solved a fraction division problem using the rule " multiply by the reciprocal ". Her work is shown below 2/3 divided by 4/5 2/3 x 4/5 = 8/15 PLS PLS HELPAn area surrounded by tall mountains contains a very large, isolated population of green and white peacocks. During the mating season, the male peacocks demonstrate flashy feather displays to attract females, who usually choose green peacocks over white ones. A biology student tabulates the following information.GenotypePlumage Color % of Population Allele Controlled PhenotypeFF or Ff Dark green84%F (dominant)Dark green plumageff White16% f (recessive)White plumageUsing this information, the student plans to use the Hardy-Weinberg equation to predict the allele frequencies in future peacock generations. Why would her research advisor have a problem with this? (2 points)Group of answer choicesThe student needs the percent of the population with the Ff genotype in order to find the F frequency.Her research advisor would first want her to find the males' mating success rate for the calculations.The peacocks are sexually selective when choosing mates, so future allele frequencies may drift.Since the peacock population is isolated, its alleles would shift away from Hardy-Weinberg equilibrium.