Stoichiometry Calculations

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Stoichiometry Calculations

• Section 12.1
• Mole to mole calculations

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Section 12.2Mole to Mole conversions

• If the problem gives you moles and ask for moles
  as an answer you have a mole-mole problem
• If you needed 3 moles of H2 gas produced, how
  many moles of potassium do you need to react?
• ? Moles 3 moles
• 2 K 2 H2O ? 2 KOH 1 H2
• 1x 2 x 3
• x 6 moles

If we place the numbers given in the problem over
the balanced equation our ratios are set up for
us. Just pull down the numbers to form ratios.
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Stoichiometry Practice I

• 2 H2 O2 ? 2 H2O
• How many moles of water can be produced with 6
  moles of hydrogen?
• 6 mol x mol
• 2 H2 O2 ? 2 H2O
• x 6 mol

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Stoichiometry Practice I

• 2 H2 O2 ? 2 H2O
• How many moles of oxygen would be required to
  fully react with 8 moles of hydrogen?
• 8 mol x mol
• 2 H2 O2 ? 2 H2O
• 2x 8
• x 4 moles of Oxygen

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Stoichiometry Practice I

• 2 H2 O2 ? 2 H2O
• How many moles of water can be produced with 4
  moles of oxygen?
• 4 mol x mol
• 2 H2 O2 ? 2 H2O
• x 4 (2) 8 mol

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Stoichiometry Practice I

• 2 H2 O2 ? 2 H2O
• How many moles of hydrogen would be required to
  produce 10 moles of water?
• ? mol 10 mol
• 2 H2 O2 ? 2 H2O
• 2x 20
• x 10 moles

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Stoichiometry Practice I

• 2 H2 O2 ? 2 H2O
• How many moles of oxygen would be needed to
  produce 20 moles of water?
• ? mol 20 mol
• 2 H2 O2 ? 2 H2O
• 2x 20
• x 10 moles