Answer:c
Explanation:
how many moles of methane are in 7.31*10^25 molecules?
121 mol CH₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Organic
Writing chemical compoundsWriting organic structuresPrefixesAlkanes, Alkenes, AlkynesAtomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.31 × 10²⁵ molecules CH₄
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 7.31 \cdot 10^{25} \ molecules \ CH_4(\frac{1 \ mol \ CH_4}{6.022 \cdot 10^{23} \ molecules \ CH_4} ) = 121.388 \ mol \ CH_4[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
121.388 mol CH₄ ≈ 121 mol CH₄
What is the mass of a 270 cm3 sample of a metal with density of 3.66 g/cm3?
Answer:
988.2 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 3.66 × 270
We have the final answer as
988.2 gHope this helps you
PLEASE HELP ASAP Chet is creating a catapult that will allow him to propel a ball farther than he is capable of throwing it. As he is creating the device, he finds that that catapult launches the ball straight up into the air. The catapult should propel the ball up and forward to create a trajectory.
Which of the following is the best solution to this problem?
A.
leave the design as is because the ball goes higher than he can throw it
B.
make changes to the design to allow it to launch the ball a farther distance
C.
discard the device and begin the engineering process again from the start
D.
leave the design as is but perform more tests to see if the problem improves
Answer:
IM NOT COMPLETELY SURE BUT ITS ETHER A OR B IM SORRY ;//
Explanation:
How many total ions are in 2.95 g of magnesium sulfite?
Answer:
Approximately [tex]5.65 \times 10^{-2}\; \rm mol[/tex], which is approximately [tex]3.41 \times 10^{22}[/tex] particles.
Explanation:
Formula of magnesium sulfite: [tex]\rm MgSO_3[/tex].
Look up the relative atomic mass of [tex]\rm Mg[/tex]. [tex]\rm S[/tex], and [tex]\rm O[/tex] on a modern periodic table:
[tex]\rm Mg[/tex]: [tex]24.305[/tex].[tex]\rm S[/tex]: [tex]32.06[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].The ionic compound [tex]\rm MgSO_3[/tex] consist of magnesium ions [tex]\rm {Mg}^{2+}[/tex] and sulfite ions [tex]\rm {SO_3}^{2-}[/tex].
Notice that [tex]\rm {Mg}^{2+}\![/tex] and [tex]\rm {SO_3}^{2-}\![/tex] combine at a one-to-one ratio to form the neural compound [tex]\rm MgSO_3[/tex]. Therefore, each [tex]\rm MgSO_3\![/tex] formula unit would include one [tex]\rm {Mg}^{2+}[/tex] ion and one [tex]\rm {SO_3}^{2-}[/tex] ion (that would be two ions in total).
Calculate the formula mass of one such formula unit:
[tex]\begin{aligned}&\; M(\mathrm{MgSO_3}) \\ = & \; 24.305 + 32.06 + 3 \times 15.999 \\ = & \; 104.362\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
In other words, the mass of one mole of [tex]\rm MgSO_3[/tex] formula units (which includes one mole of [tex]\rm {Mg}^{2+}[/tex] ions and one mole of [tex]\rm {SO_3}^{2-}[/tex] ions) would be [tex]104.362\; \rm g[/tex].
Calculate the number of moles of such formula units in that [tex]2.95\; \rm g[/tex] of [tex]\rm MgSO_3[/tex]:
[tex]\begin{aligned}n&= \frac{m}{M}\\ &=\frac{2.95\; \rm g}{104.362\; \rm g \cdot mol^{-1}} \approx 2.82670 \times 10^{-2}\; \rm mol\end{aligned}[/tex].
There are two moles of ions in each mole of [tex]\rm MgSO_3[/tex] formula units. Therefore, that [tex]2.82670 \times 10^{-2}\; \rm mol[/tex] of [tex]\rm MgSO_3\![/tex] formula units would include approximately [tex]2 \times 2.82670 \times 10^{-2}\; \rm mol \approx 5.65\times 10^{-2}\; \rm mol[/tex] of ions.
What conversion factors
determine the number of
molecules from the number of
moles of a compound?
Answer: Avogrado's number, or 6.022 x 10^23
Explanation:
To convert from moles to atoms, multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number (or multiply by its reciprocal).
What happens to water when it freezes?
its mass increases
its mass decreases
its density increases
its density decreases
Explanation:
When an object undergoes a physical change (solid to liquid, decrease in temperature etc.), the mass of the object remains constant.
When water freezes, the water molecules vibrate closer to one another and there is less space between the molecules.
The same number of water molecules now occupy a smaller volume, therefore their density increases.
The correct answer is the 3rd option.
At the time when the water should be freezed so here the density should be decreased.
What is density?The density refers to the mass of the unit volume with respect to the material substance.
The formula for density should be d = M/v
So here d means the density
And, m means mass
V means the volume
So it should be expressed in units with respect to the units of grams per cubic centimeter.
Hence the last option is correct.
Learn more about water here: https://brainly.com/question/24720645
A crystal of quartz may be part of granite, sandstone, and the
metamorphic rock quartzite. Identify how that same crystal could be
found in all three rocks at different times.
HELP ME WITH THIS QUESTION
hi...need help....thank you..
Answer:
36 oxygen atoms
Explanation:
From the question given above, the following data were obtained:
Compound => 4Al₂(CO₃)₃
Number of Oxygen atom in the compound =?
The number of oxygen atom in the above compound can be obtained as follow:
4Al₂(CO₃)₃
Al = 4 × 2 = 8 atoms
C = 4 × 3 × 1 = 12 atoms
O = 4 × 3 × 3 = 36 atoms
From the simple illustration made above, there are 36 oxygen atoms in the compound.
Automobile catalytic converters use a platinum catalyst to reduce air pollution by changing emissions such as carbon monoxide, CO(g), into carbon dioxide, CO2(g). The uncatalyzed reaction is represented by the balanced equation below.2CO(g) O2(g) 2CO2(g) +heat. determine the mass of O2(g) required to completely react with 784g moles of CO(g) during this reaction.
Answer: 448 g of [tex]O_2[/tex] will be required to completely react with 784g moles of CO(g) during this reaction.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} CO=\frac{784g}{28g/mol}=28moles[/tex]
The balanced chemical equation is:
[tex]2CO(g)+O_2(g)\rightarrow 2CO_2(g)[/tex]
According to stoichiometry :
2 moles of [tex]CO[/tex] require = 1 mole of [tex]O_2[/tex]
Thus 28 moles of [tex]CO[/tex] will require=[tex]\frac{1}{2}\times 28=14moles[/tex] of [tex]O_2[/tex]
Mass of [tex]O_2=moles\times {\text {Molar mass}}=14moles\times 32g/mol=448g[/tex]
Thus 448g of [tex]O_2[/tex] will be required to completely react with 784g moles of CO(g) during this reaction.
Answer:
Boy I'm really boutta get to yo pickle chin ahh boy, egg head like collard greens head a//ss boy, oh hell nah boy yo dirt ahh boy stank ahh boy afro head ahh, lip gloss chin ahh boy ugly ahh boi
Explanation:
Describe the brightness and temperature of the stars classified as giants.
Answer:
A hotter star should be brighter than a cooler star. ... Although they are cool [red], they are very luminous, and therefore bright. In the Main Sequence, stars that are cool are not as luminous. Because the energy is spread across a larger area, surface temperatures are actually cooler, reaching only 2,200 to 3,200 degrees Celsius (4,000 to 5,800 degrees Fahrenheit), a little over half as hot as the sun
Explanation:
The sun is located in the center of our solar system. Where is the sun located in our disc-shaped
galaxy?
*Answer:-*
The sun is about 1/3 the distance from the center of the Milky Way galaxy to its outer edges. It's located in a smaller spiral arm, between two large arms, called the Orion Arm.
How many molecules are there in 31.8 moles of water?
1.91 x 1025 molecules
1.91 x 1022
5.28 x 10-23 molecules
5.28x 10.25
Answer:
[tex]31.8\ moles = 1.91 * 10^{25}\ molecules[/tex]
Explanation:
Given
31.8 moles of water
Required
Determine the number of molecule
In standard units: 1 molecule of water is:
[tex]1\ mole = 6.022 * 10^{23}\ molecules[/tex]
Multiply both sides by 31.8
[tex]31.8 * 1\ mole = 31.8 * 6.022 * 10^{23}\ molecules[/tex]
[tex]31.8\ moles = 31.8 * 6.022 * 10^{23}\ molecules[/tex]
[tex]31.8\ moles = 191.4996 * 10^{23}\ molecules[/tex]
Express 191.4996 as a standard form
[tex]31.8\ moles = 1.914996 * 10^2 * 10^{23}\ molecules[/tex]
Apply law of indices:
[tex]31.8\ moles = 1.914996 * 10^{2+23}\ molecules[/tex]
[tex]31.8\ moles = 1.914996 * 10^{25}\ molecules[/tex]
Approximate:
[tex]31.8\ moles = 1.91 * 10^{25}\ molecules[/tex]
Hi guys . I'm having some troubles with physics and chemistry .
Do you know any sites or apps that can help me with any topic in physics and chemistry ( apart from Khan academy ) ?
Note : The site or app has to be able to teach and explain topics in Physics and Chemistry .
Explanation:
byju's ig. Cause it gives a proper concept
Emilio wants to tell a friend where an element's name is located within it's box in the periodic table. Which of the following is an accurate explanation to find an element's name?
the name is at the top of the box
the name is the large letter or letter combination in the box
the name is the word below the large letter combination in the box
the name is the last piece of information in the box
Answer:
A
Explanation:
hope this helps!
The name is the word below the large letter combination in the box
Density can be calculated by dividing an object's mass by its volume. If the mass of an object is 10 grams and its volume is 2 milliliters, what is its density?
Explanation:
mass =10g. volume=2ml. density=mass/volume = 10/2=5kg/m^3Answer:
5 g/mL
Explanation:
So, if the mass is 10 g and the volume is 2 mL, the density equals...
10 g ÷ 2 mL = 5 g/mL
If the gas tap to the Bunsen burner is turned on, the methane does not start burning until it is lit with a match. Why is heat from the match needed to start the methane burning?
Answer:
The reaction has a high activation energy
Explanation:
The burning of methane is a spontaneous reaction. Once the burning begins, the flame is able to sustain itself without any additional input of energy. It is an exothermic reaction in which energy is given out in the form of heat.
The reason why heat from the match is needed to start the burning of methane is that the activation energy of the combustion of methane is high. Activation energy is the energy that must be supplied in order for the collision of reactants to result in chemical reaction.
As long as the activation energy is high, the reaction can not occur without an external input of energy (e.g striking a match). Hence the answer.
Can someone help me on this letter E please
How many hydrogen atoms Is needed for C4H8 to become saturated
Answer:
2 atoms
Explanation:
Because it contain one double bond
help me with cience for brainest:) its easy:)
Answer:
Stronger
And its science
Explanation:
Answer:
stronger for top.
weaker for bottom.
passed all sciences in freshman year :D
Photosynthesis requires light, water, and CO2 to work. When one of these factors is in short supply, it is called a limiting factor. Temperature can also be a limiting factor when it is too hot or too cold for photosynthesis to work well. If you are trying to grow plants in a greenhouse, why is it important to know the limiting factor?
A farmer can be more successful in understanding which plant produces and how to grow plants with a higher degree of photosynthesis with less material and time exhaustion, by recognizing what the limiting factor is.
Hope this helps! Please correct me if I'm wrong :)
Please help If You Are Able To. Where do these go?
Answer:
Sorry can't help
Explanation:
Cant help!
scientific notation, fill in the blank.
7.95x10^7 = [ ? ]x 10^6
Answer:
79.5
Explanation:
7.95x10^7 IS 79500000.
If you bring the decimal point left 6 more times it would be 79.500000
an object moving with a speed of 5m/s has a kinetic energy of 100J what is the mass of the object
Answer:
k. e. = 1/2 mv^2
100 = 1/2 * m * 5^2
100 = 1/2 * m * 25
m = 100 *2/25
m = 8 kg
hope it helps you
How many neutrons are in neon?
Answer:
10
Explanation:
How many
How long does it take to go
from a new moon to a third
quarter?
Answer:
about three weeks
Explanation:
because after a full moon, which is about 21 days, it comes to a third quarter moon
Explain the process of ionic bond formation between K
(potassium, a metal) and Br (bromine, a nonmetal).
I
Answer:
Metals transfers electrons to nonmetals. So K transfers one electron to Br because K is located at 1A in the periodic table. Br has seven electrons, now both K and Br are stable by gaining and losing one electron. The transfer of electrons makes metals to become positive ions and nonmetal to become negative ions. When an ionic bond is formed, the charges attract each other.
Answer: Metals transfers electrons to nonmetals. Potassium -K transfers one electron to bromine- Br because K is located in group 1A on periodic table. Br has seven electrons and located group 7A. Both K and Br stable by gaining and losing one electron. The transfer of electrons makes metals to become + positive ions and nonmetal to become - negative ions. An ionic bond is formed, the charges attract each other.
Explanation: Metals donate, or transfer, electrons to the nonmetal.
The transfer of electrons creates a positive ion and a negative ion.
An ionic bond is formed when the charges attract each other.
The monomers of carbohydrates are called?
Answer:
monosaccharides
Explanation:
Monomers of carbohydrates are simple sugars and the basic building blocks of carbohydrates, they are also known as monosaccharides and are used by the cells of living things to store and produce energy.
Answer:
"the simple sugars" or Monosaccharides
Explanation:
Monosaccharides are the monomers of carbohydrates they are mostly called or referred to as "the simple sugars" hope this helped have a nice day (:
plz mark brainliest (:
What is a daughter element
Answer:
The element formed when a radioactive element undergoes radioactive decay. The latter is called the parent. The daughter may or may not be radioactive.
Explanation:
hope this helps
Can you please help me ASAP
Answer:
The Milky Way is a large barred spiral galaxy
Explanation: that has more than etc
The answer is not 53.4. Please help.
Answer:
it is 0.528 ATM.
Explanation: