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Chapter 11: The Mole

Practice Test
  1.A compound contains sulfur, oxygen, and chlorine. Analysis of a sample showed that it contained by mass 26.95% sulfur and 59.61% chlorine. What is the simplest formula for this compound?  
  a.   SO2Cl2.  
  b.   SOCl  
  c.   SO2Cl  
  d.   SOCl2.  
  2.What relationship is described by the formula below?
(mass of the element/mass of the compound) × 100
  a.   empirical formula  
  b.   percent composition  
  c.   mole ratio  
  d.   Avogadro’s number  
  3.What is the mass of 1.0 × 1012 molecules of O2?  
  a.   2.7 × 10-11 g  
  b.   6.0 × 1011 g  
  c.   1.9 × 1013 g  
  d.   5.3 × 10-11 g  
  4.A 4.628-g sample of an iron oxide was found to contain 3.348 g of iron and 1.280 g of oxygen. What is the simplest formula for this compound?  
  a.   Fe3O4  
  b.   FeO2  
  c.   Fe2O3  
  d.   FeO  
  5.What is the percent composition of carbon dioxide CO(2)?  
  a.   73% C and 27% O  
  b.   33% C and 66% O  
  c.   27% C and 73% O  
  d.   50% C and 50% O  
  6.An empirical formula mass is found to be 17 g/mol. The molar mass is found to be 34 g/mol. What is the number of empirical formula units in this molar mass?  
  a.   17 units  
  b.   1 unit  
  c.   2 units  
  d.   0.5 unit  
  7.How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(3)?  
  a.   6.0 mol  
  b.   8.0 mol  
  c.   2.0 mol  
  d.   3.0 mol  
  8.What mass of iron is contained in 62.8 grams of pyrite FeS(2)?  
  a.   40.3 g  
  b.   58.5 g  
  c.   31.7 g  
  d.   29.2 g  
  9.What is the mass of 5.0 × 1021 molecules of water?  
  a.   6.02 x 1023 g  
  b.   0.15 g  
  c.   8.3 x 10-3 g  
  d.   5.0 g  
  10.Analysis of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?  
  a.   C2 H3  
  b.   CH  
  c.   CH2  
  d.   CH2  
  11.Which word indicates that two water molecules are associated with a substance in a chemical compound?  
  a.   di-  
  b.   tri-  
  c.   mono-  
  12.How many moles of atoms are present in one mole of water?  
  a.   6 mol  
  b.   1 mol  
  c.   3 mol  
  d.   2 mol  
  13.How many molecules of ammonia are present in 34.0 g of ammonia NH(3)?  
  a.   34  
  b.   6.02 × 1023  
  c.   1.77 × 1022  
  d.   1.20 × 1024  
  14.Calculate the number of atoms in 4.00 × 10-5 g sodium.  
  a.   3.24 × 1023 atoms  
  b.   1.05 × 1018 atoms  
  c.   3.92 × 1019 atoms  
  d.   5.54 × 1020 atoms  
  15.What is the molar mass of H2CrO4?  
  a.   118 g  
  b.   2 g  
  c.   64 g  
  d.   52 g  
  16.How many moles of C3H8 are present in 451 g C3H8?  
  a.   3.84 mol  
  b.   1.44 mol  
  c.   10.2 mol  
  d.   0.879 mol  
  17.How is one gram defined?  
  a.   one mole of protons  
  b.   0.1 mole of amu  
  c.   10 moles of amu  
  d.   one mole of amu  
  18.How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
  a.   1.0 mol  
  b.   2.0 mol  
  c.   4.0 mol  
  d.   0.5 mol  
  19.A compound that has a specific number of water molecules bound to the structure is ______________?  
  a.   a hydrate  
  b.   aqueous  
  c.   an anhydrate  
  d.   waterlogged  
  20.What is the mass of one mole of carbon-12 atoms?  
  a.   12 grams  
  b.   12 amu  
  c.   6 grams  
  d.   6 amu  

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