# The Mole

10 Questions

This quiz will measure how prepared you are to take your exam on the mole next class. It contains the following types of problems: Molar Mass Grams-Moles Conversions Empirical Formula Molecular Formula

• 1.
What is the molar mass of CH4 (methane)?
• A.

12.01 g/mol

• B.

13.02 g/mol

• C.

16.05 g/mol

• D.

32.10 g/mol

• 2.
What is the molar mass of (NH4)2CO3 (Ammonium carbonate)?
• A.

96.11 g/mol

• B.

82.10 g/mol

• C.

106.11 g/mol

• D.

43.01 g/mol

• 3.
What is the molar mass of Cu3(PO4)2?
• A.

253.49 g/mol

• B.

380.59 g/mol

• C.

110.22 g/mol

• D.

348.59 g/mol

• 4.
Find the empirical formula of a substance that contains 62.6% Ca and 37.4% C.
• A.

CaC2

• B.

Ca10C4

• C.

Ca5C3

• D.

Ca7C10

• E.

None of the above

• 5.
Find the empirical formula of a compound that contains 36.8% N and 63.2% O.
• A.

N16O

• B.

N2O3

• C.

N7O4

• D.

N2O4

• E.

None of the above

• 6.
What is the molecular formula of a compound that contains 65.45%C, 5.45%H, and 29.10%O if the molar mass of the compound is 110 g/mol?
• A.

C3H2O5

• B.

C6H12O2

• C.

C9H3O

• D.

C3H7O4

• E.

None of the above

• 7.
How many grams of NaCl is present in 6.3 moles?
• A.

9.27 g

• B.

58.44 g

• C.

231.2 g

• D.

368.17 g

• E.

None of the above

• 8.
How many grams are in 2.3 moles of Na2SO4? (The molar mass of Na2SO4 is 142.05g/mol)
• A.

61.76 g

• B.

81.68 g

• C.

163.36 g

• D.

326.72 g

• E.

None of the above

• 9.
How many moles of LiBr are there in 486.30 g of LiBr? (The molar mass of LiBr = 86.84 g/mol)
• A.

3.0 moles

• B.

5.6 moles

• C.

193.2 moles

• D.

42,230.292 moles

• E.

None of the above

• 10.
How many moles of K­2O are in 367.38 g of K2O?
• A.

3.9 moles

• B.

5.9 moles

• C.

367.38 moles

• D.

34,607.2 moles

• E.

None of the above

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