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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.   SO2Cl  
  b.   SOCl2.  
  c.   SOCl  
  d.   SO2Cl2.  
  2.Calculate the number of atoms in 4.00 × 10-5 g sodium.  
  a.   3.24 × 1023 atoms  
  b.   3.92 × 1019 atoms  
  c.   5.54 × 1020 atoms  
  d.   1.05 × 1018 atoms  
  3.What mass of calcium metal could be obtained from 1 kg of limestone that is 50.0% pure CaCO3?  
  a.   0.05 kg  
  b.   0.2 kg  
  c.   0.5 kg  
  d.   0.4 kg  
  4.How many moles of C3H8 are present in 451 g C3H8?  
  a.   10.2 mol  
  b.   0.879 mol  
  c.   3.84 mol  
  d.   1.44 mol  
  5.What is the mass of 5.0 × 1021 molecules of water?  
  a.   8.3 x 10-3 g  
  b.   5.0 g  
  c.   6.02 x 1023 g  
  d.   0.15 g  
  6.What is the percent composition of carbon dioxide CO(2)?  
  a.   50% C and 50% O  
  b.   27% C and 73% O  
  c.   33% C and 66% O  
  d.   73% C and 27% O  
  7.How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
  a.   0.5 mol  
  b.   1.0 mol  
  c.   4.0 mol  
  d.   2.0 mol  
  8.How many particles are present in one mole of particles?  
  a.   1  
  b.   3.0 × 108  
  c.   12  
  d.   6.02 × 1023  
  9.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.   3.0 mol  
  d.   2.0 mol  
  10.What mass of iron is contained in 62.8 grams of pyrite FeS(2)?  
  a.   31.7 g  
  b.   40.3 g  
  c.   29.2 g  
  d.   58.5 g  
  11.How many molecules of ammonia are present in 34.0 g of ammonia NH(3)?  
  a.   1.20 × 1024  
  b.   6.02 × 1023  
  c.   34  
  d.   1.77 × 1022  
  12.How is one gram defined?  
  a.   one mole of amu  
  b.   0.1 mole of amu  
  c.   10 moles of amu  
  d.   one mole of protons  
  13.A compound that has a specific number of water molecules bound to the structure is ______________?  
  a.   an anhydrate  
  b.   waterlogged  
  c.   aqueous  
  d.   a hydrate  
  14.What is the mass of 1.0 × 1012 molecules of O2?  
  a.   1.9 × 1013 g  
  b.   5.3 × 10-11 g  
  c.   6.0 × 1011 g  
  d.   2.7 × 10-11 g  
  15.How many moles of atoms are present in one mole of water?  
  a.   1 mol  
  b.   6 mol  
  c.   3 mol  
  d.   2 mol  
  16.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.   FeO2  
  b.   FeO  
  c.   Fe2O3  
  d.   Fe3O4  
  17.Which word indicates that two water molecules are associated with a substance in a chemical compound?  
  a.   tri-  
  b.   mono-  
  c.   di-  
  18.What relationship is described by the formula below?
(mass of the element/mass of the compound) × 100
  a.   mole ratio  
  b.   Avogadro’s number  
  c.   percent composition  
  d.   empirical formula  
  19.What is the molar mass of H2CrO4?  
  a.   2 g  
  b.   118 g  
  c.   52 g  
  d.   64 g  
  20.A sample of a compound is found to contain 0.404 grams of Fe and 0.174 grams of O. What is the empirical formula for this compound?  
  a.   FeO  
  b.   Fe3O4  
  c.   Fe2O3  
  d.   FeO2  

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