# Challenge 8.3 - One Step Mole Conversions

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Cbrammell
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Quizzes Created: 1 | Total Attempts: 314
Questions: 8 | Attempts: 314  Settings  • 1.

### What is the mass of 4.65 moles of oxygen gas? (O2)

• A.

149 g of O2

• B.

4.65 g of O2

• C.

0.145 g of O2

• D.

0.15 g of O2

A. 149 g of O2
Explanation
option 1 is right
option 2 is wrong because you did not covert
option 3 is wrong because you flipped your conversion factor
option 4 is wrong because you flipped your conversion factor and have the wrong answer according to sig figs

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• 2.

### How many moles of carbon dioxide are in 22.5 grams of CO2?

• A.

990 moles of CO2

• B.

22.5 moles of CO2

• C.

0.511 moles of CO2

• D.

44.01 moles of CO2

C. 0.511 moles of CO2
Explanation
option 1 is wrong because you flipped your conversion factor
option 2 is wrong because you did not convert
option 3 is correct
option 4 is wrong because that is the molar mass of CO2

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• 3.

### How many moles of carbon tetrafluoride are in 176 grams of CF4?

• A.

88.01 moles of CF4

• B.

176 moles CF4

• C.

15500 moles of CF4

• D.

2.00 moles of CF4

D. 2.00 moles of CF4
Explanation
option 1 is wrong because that is the molar mass of CF4
option 2 is wrong because you did not covert
option 3 is wrong because you flipped your conversion factor
option 4 is right

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• 4.

### A chemists needs 3.52 moles of aluminum oxide, Al2O3, for a particular experiment. How many grams of Al2O3 should she weight out?

• A.

359 g of Al2O3

• B.

0.0345 g of Al2O3

• C.

102 g of Al2O3

• D.

3.52 g of Al2O3

A. 359 g of Al2O3
Explanation
option 1 is right
option 2 is wrong because you flipped your conversion factor
option 3 is wrong because it is the molar mass of Al2O3
option 4 is wrong because you did not convert

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• 5.

### How many atoms are in 7.86 moles of sodium chloride?

• A.

459 atoms of NaCl

• B.

4.73 x10^24 atoms of NaCl

• C.

1.31 x 10^-23 atoms of NaCl

• D.

6.02 x10^23 atoms of NaCl

B. 4.73 x10^24 atoms of NaCl
Explanation
option 1 is wrong because you did not use the right conversion factor
option 2 is right
option 3 is wrong because you flipped your conversion factor
option 4 is wrong because it is avogadro's number only

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• 6.

### A chemist has 5.69 x 10^26 molecules of strontium chloride. How many moles of strontium chloride do they have?

• A.

158.52 moles of strontium chloride

• B.

6.02 x 10^23 moles of strontium chloride

• C.

3.43 x 10^50 moles of strontium chloride

• D.

945 moles of strontium chloride

D. 945 moles of strontium chloride
Explanation
Option 1 is wrong because that is the molar mass of SrCl2
option 2 is wrong because that is avogadros number
option 3 is wrong because you flipped your conversion factor
option 4 is right

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• 7.

### How many liters of carbon dioxide are in 63.5 moles of CO2?

• A.

1.44 L CO2

• B.

1420 L CO2

• C.

3.93 x 10^25 L CO2

• D.

2490 L CO2

B. 1420 L CO2
Explanation
option 1 is wrong because you flipped your conversion factor
option 2 is right
option 3 is wrong because you used avogadros number
option 4 is wrong because you used the molar mass of CO2

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• 8.

### How many moles of liquid dihydrogen monoxide are there when you have 253 L of dihydrogen monoxide?

• A.

11.3 moles of H2O

• B.

5670 moles of H2O

• C.

4.20 x 10^-22 moles of H2O

• D.

14.0 moles of H2O

A. 11.3 moles of H2O
Explanation
option 1 is right
option 2 is wrong because you flipped your conversion factor
option 3 is wrong because you use avogadros number
option 4 is wrong because you use molar mass

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