Stoichiometry Test Review

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Stoichiometry Test Review
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1

• Hexane (C6H14) burns in oxygen to give carbon
  dioxide and water.
• Write the balanced equation for the reaction.
• If 215 g of hexane is mixed with 215 g of oxygen,
  what mass of carbon dioxide is produced?
• What mass of water is produced?
• What mass of the excess reactant remains?
• Suppose only 150. g of carbon dioxide is
  produced. What is the percent yield?

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1 - Answers

• 2 C6H14 19 O2 ? 12 CO2 14 H2O
• 187 g carbon dioxide
• 89.2 g water
• 154 g hexane remains
• 80.2

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• 16.04 g of benzene, C6H6, is burned in oxygen.
• Write the balanced equation for the reaction.
• What mass of oxygen is required to react all
  16.04 g of benzene?
• What is the total mass of products expected?
• What will we obtain less product than we would
  predict?

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2 - Answer

• Carbon dioxide and water
• 2 C6H6 15 O2 ? 12 CO2 6 H2O
• 49.28 g oxygen
• 65.32 g products
• No reaction truly has 100 yield. The mass that
  was apparently lost is most likely still in the
  form of the reactants.