# The Mole

10 Questions  I  By Sullivanchem
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

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 1 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
 2 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
 3 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
 4 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
 5 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
 6 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
 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 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
 10 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
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