Chemical Equilibrium

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Chemical Equilibrium

• 17.1
• Dynamic Equilibrium
• The Equilibrium Constant Keq

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Reversible Reactions

• 2 SO2 O2 ? 2 SO3

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Reversible Reactions

• 2 SO2 O2 ? 2 SO3
• 2 SO3 ? 2 SO2 O2

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Reversible Reactions

• 2 SO2 O2 ? 2 SO3
• 2 SO3 ? 2 SO2 O2
• 2 SO2 O2 ?? 2 SO3

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Dynamic Equilibrium
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Dynamic Equilibriumin Chemical Reactions

• 2 SO2 O2 ?? 2 SO3

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Equilibrium Constant - Keq

• aA bB ?? cC dD
• Keq Cc Dd
• AaBb

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Equilibrium Constant - Keq

• 2 SO2 O2 ?? 2 SO3
• Keq SO32
• SO22 O2

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Equilibrium Constant - Keq

• Keq Cc Dd
• AaBb
• Keq gt 1 Products are favored
• Keq lt 1 Reactants are favored

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Sample Problem A

• Find Keq for the following situation
• Hydrogen gas and fluorine gas combine reversibly
  to form hydrogen fluoride gas. If their
  equilibrium concentrations are as follows,
  hydrogen .05 moles, fluorine .07 moles and
  hydrogen fluoride .24 moles, what is the
  equilibrium constant?

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Sample Problem B

• At high temperatures, Carbon Monoxide and Steam
  react reversibly to form Hydrogen and Carbon
  Dioxide. The equilibrium partial pressures of
  Carbon Monoxide and Steam are .41 atm and .38 atm
  respectively. If the equilibrium constant is
  1.19, and Carbon Dioxide and Hydrogen were
  produced in equal amounts, what are the partial
  pressures of the two product gasses?