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Chapter 11: The Mole

Practice Test
  1.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.   Fe3O4  
  d.   Fe2O3  
  2.What is the percent composition of carbon dioxide CO(2)?  
  a.   33% C and 66% O  
  b.   50% C and 50% O  
  c.   27% C and 73% O  
  d.   73% C and 27% O  
  3.How many particles are present in one mole of particles?  
  a.   6.02 × 1023  
  b.   1  
  c.   12  
  d.   3.0 × 108  
  4.What is the molar mass of H2CrO4?  
  a.   64 g  
  b.   52 g  
  c.   2 g  
  d.   118 g  
  5.How many molecules of ammonia are present in 34.0 g of ammonia NH(3)?  
  a.   6.02 × 1023  
  b.   1.20 × 1024  
  c.   34  
  d.   1.77 × 1022  
  6.What mass of calcium metal could be obtained from 1 kg of limestone that is 50.0% pure CaCO3?  
  a.   0.2 kg  
  b.   0.5 kg  
  c.   0.4 kg  
  d.   0.05 kg  
  7.What is the mass of 5.0 × 1021 molecules of water?  
  a.   0.15 g  
  b.   5.0 g  
  c.   6.02 x 1023 g  
  d.   8.3 x 10-3 g  
  8.How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
  a.   4.0 mol  
  b.   1.0 mol  
  c.   2.0 mol  
  d.   0.5 mol  
  9.How can the actual molecular formula be determined?  
  a.   from the molar mass alone  
  b.   from the molar mass divided by the mass of the empirical formula  
  c.   from the molar mass multiplied by the mass of the empirical formula  
  d.   from the empirical formula alone  
  10.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.   Fe2O3  
  c.   FeO2  
  d.   Fe3O4  
  11.How is one gram defined?  
  a.   10 moles of amu  
  b.   0.1 mole of amu  
  c.   one mole of amu  
  d.   one mole of protons  
  12.What mass of iron is contained in 62.8 grams of pyrite FeS(2)?  
  a.   29.2 g  
  b.   40.3 g  
  c.   58.5 g  
  d.   31.7 g  
  13.A compound that has a specific number of water molecules bound to the structure is ______________?  
  a.   a hydrate  
  b.   an anhydrate  
  c.   waterlogged  
  d.   aqueous  
  14.Which word indicates that two water molecules are associated with a substance in a chemical compound?  
  a.   tri-  
  b.   di-  
  c.   mono-  
  15.How many moles of atoms are present in one mole of water?  
  a.   6 mol  
  b.   3 mol  
  c.   1 mol  
  d.   2 mol  
  16.How many moles of C3H8 are present in 451 g C3H8?  
  a.   10.2 mol  
  b.   0.879 mol  
  c.   1.44 mol  
  d.   3.84 mol  
  17.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  
  18.What is the SI base unit used to measure the amount of a substance?  
  a.   kelvin  
  b.   meter  
  c.   mole  
  d.   kilogram  
  19.What relationship is described by the formula below?
(mass of the element/mass of the compound) × 100
  a.   Avogadro’s number  
  b.   empirical formula  
  c.   percent composition  
  d.   mole ratio  
  20.How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(3)?  
  a.   2.0 mol  
  b.   8.0 mol  
  c.   6.0 mol  
  d.   3.0 mol  

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