Challenge 8.3 - One Step Mole Conversions
- 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
Correct Answer
A. 149 g of O2Explanation
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 figsRate this question:
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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
Correct Answer
C. 0.511 moles of CO2Explanation
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 CO2Rate this question:
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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
Correct Answer
D. 2.00 moles of CF4Explanation
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 rightRate this question:
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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
Correct Answer
A. 359 g of Al2O3Explanation
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 convertRate this question:
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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
Correct Answer
B. 4.73 x10^24 atoms of NaClExplanation
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 onlyRate this question:
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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
Correct Answer
D. 945 moles of strontium chlorideExplanation
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 rightRate this question:
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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
Correct Answer
B. 1420 L CO2Explanation
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 CO2Rate this question:
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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
Correct Answer
A. 11.3 moles of H2OExplanation
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 massRate this question:
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