Reaction Quotient and Equilibrium Constant

AP Chemistry· difficulty 2/5

Pure solids and pure liquids are excluded from K expressions.

CaCO3(s) <-> CaO(s) + CO2(g) K = ? (only gases / aqueous in K)

What is the correct equilibrium expression?

  • A

    K = [CO2]

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  • B

    K = [CaO][CO2]/[CaCO3]

  • C

    K = [CO2]/[CaCO3]

  • D

    K = [CaO][CO2]

Explanation

Pure solids do not appear in K. Only the gaseous CO2 contributes: K = [CO2] (or Kp = P_CO2).

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