STOICHIOMETRY

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STOICHIOMETRY
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What is stoichiometry?

• Stoichiometry is the quantitative study of
  reactants and products in a chemical reaction.

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Mole Ratios

• The proportions of reactants and products (the
  recipe) is referred to as the MOLE RATIO.
• A mole ratio converts moles of one compound in a
  balanced chemical equation into moles of another
  compound.

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Example

• Reaction between magnesium and oxygen to form
  magnesium oxide.
• 2 Mg(s) O2(g) 2 MgO(s)
• Mole Ratios
• 2 1 2

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Practice Problems

• N2 3 H2 2 NH3
• Write the mole ratios for N2 to H2 and NH3 to
  H2.
• Butane (C4H10) is a fuel used in BBQ lighters.
  Write out a balance reaction equation for the
  complete combustion of butane.
• A can of butane lighter fluid contains 1.20 moles
  of butane calculate the number of moles of carbon
  dioxide given off when this butane is burned.

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Mole-Mole Problems

• Equation of reaction
• 2C4H10 13O2 8CO2
  10H2O
• Mole ratio
• C4H10 CO2
• 2 8 from equation
• 1.2 X problem
• 2 8 1.2 X
• Solving equivalent ratios, MEANSEXTREMES
• X 4.8 mols of CO2 given off

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Homework

• Read section7.1
• Bottom half of handout from yesterday
• Page 319 1-3
• Questions on pg 320 if more practice needed