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Chapter 11: The Mole

Practice Test
  1.A compound that has a specific number of water molecules bound to the structure is ______________?  
  a.   an anhydrate  
  b.   a hydrate  
  c.   waterlogged  
  d.   aqueous  
  2.What mass of calcium metal could be obtained from 1 kg of limestone that is 50.0% pure CaCO3?  
  a.   0.05 kg  
  b.   0.4 kg  
  c.   0.5 kg  
  d.   0.2 kg  
  3.What is the SI base unit used to measure the amount of a substance?  
  a.   kilogram  
  b.   meter  
  c.   kelvin  
  d.   mole  
  4.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.   1 unit  
  b.   17 units  
  c.   0.5 unit  
  d.   2 units  
  5.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.   FeO  
  b.   FeO2  
  c.   Fe2O3  
  d.   Fe3O4  
  6.What is the mass of one mole of carbon-12 atoms?  
  a.   6 grams  
  b.   6 amu  
  c.   12 grams  
  d.   12 amu  
  7.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.   FeO2  
  b.   Fe3O4  
  c.   Fe2O3  
  d.   FeO  
  8.How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
  a.   4.0 mol  
  b.   0.5 mol  
  c.   2.0 mol  
  d.   1.0 mol  
  9.How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(3)?  
  a.   2.0 mol  
  b.   3.0 mol  
  c.   6.0 mol  
  d.   8.0 mol  
  10.What relationship is described by the formula below?
(mass of the element/mass of the compound) × 100
  a.   Avogadro’s number  
  b.   mole ratio  
  c.   empirical formula  
  d.   percent composition  
  11.How many moles of atoms are present in one mole of water?  
  a.   1 mol  
  b.   3 mol  
  c.   6 mol  
  d.   2 mol  
  12.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.   SOCl  
  b.   SOCl2.  
  c.   SO2Cl2.  
  d.   SO2Cl  
  13.What is the molar mass of H2CrO4?  
  a.   2 g  
  b.   64 g  
  c.   52 g  
  d.   118 g  
  14.What mass of iron is contained in 62.8 grams of pyrite FeS(2)?  
  a.   29.2 g  
  b.   58.5 g  
  c.   40.3 g  
  d.   31.7 g  
  15.How many moles of C3H8 are present in 451 g C3H8?  
  a.   3.84 mol  
  b.   0.879 mol  
  c.   1.44 mol  
  d.   10.2 mol  
  16.How many molecules of ammonia are present in 34.0 g of ammonia NH(3)?  
  a.   34  
  b.   6.02 × 1023  
  c.   1.20 × 1024  
  d.   1.77 × 1022  
  17.Which word indicates that two water molecules are associated with a substance in a chemical compound?  
  a.   tri-  
  b.   mono-  
  c.   di-  
  18.How is one gram defined?  
  a.   0.1 mole of amu  
  b.   one mole of amu  
  c.   10 moles of amu  
  d.   one mole of protons  
  19.What is the percent composition of carbon dioxide CO(2)?  
  a.   50% C and 50% O  
  b.   27% C and 73% O  
  c.   73% C and 27% O  
  d.   33% C and 66% O  
  20.What is the mass of 5.0 × 1021 molecules of water?  
  a.   8.3 x 10-3 g  
  b.   0.15 g  
  c.   5.0 g  
  d.   6.02 x 1023 g  

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