Honors Stoichiometry Examples

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Honors Stoichiometry Examples
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Example 1

• What mass of carbon dioxide in grams is needed to
  react with 3.00mol of H2O in the following
  photosynthetic reaction?
• 6CO2 6HOH?C6H12O6 6O2

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Answer

• 132g CO2

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Example 2

• The disinfectant hydrogen peroxide H2O2
  decomposes to form water and oxygen gas. How many
  moles of oxygen will result from the
  decomposition of 5.0 mol of hydrogen peroxide?

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Answer

• 2.5mol O2

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Example 3

• When sodium azide is activated in an automobile
  airbag, nitrogen gas and sodium are produced
  according to the equation
• 2NaN3?2Na 3N2
• If 0.500mol of NaN3 react what mass in grams of
  nitrogen would result?

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Answer

• 21.0gN2

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Example 4

• How many moles of mercury (II) oxide are needed
  to produce 125g of oxygen and mercury?

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Answer

• 7.81mol HgO

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Example 5

• When magnesium burns in air, it combines with
  oxygen to form magnesium oxide according to the
  following equation.
• 2MgO2?2MgO
• What mass in grams of magnesium oxide is produced
  from 2.00mol of magnesium?

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Answer

• 80.0g MgO

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Example 6

• Ammonia is widely used as a fertilizer and in
  many household cleaners. How many moles of
  ammonia are produced when 6 mol of hydrogen gas
  react with excess nitrogen gas?

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Answers

• 4 mol

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Example 7

• Methanol can be produced through the reaction of
  CO and H2 in the presence of a catalyst.
• CO2H2?CH3OH
• If 75.0g of CO reacts to produce 68.4g CH3OH,
  what is the percent yield of CH3OH?

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Answer

• 79.8