Multiple Choice
Which of the following is the correct expression for K_p for the reaction: N_2(g) + 3 H_2(g) ⇌ 2 NH_3(g)?
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16. Chemical Equilibrium
Equilibrium Constant K
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What is the equilibrium constant expression (K) for the reaction: CO2(g) + H2(g) ⇌ CO(g) + H2O(l)?
A
K = [CO][H2] / [CO2][H2O]
B
K = [CO] / [CO2][H2]
C
K = [CO][H2O] / [CO2][H2]
D
K = [CO][H2O] / [CO2]
Verified step by step guidance1
Identify the balanced chemical equation: \( \mathrm{CO_2(g)} + \mathrm{H_2(g)} \rightleftharpoons \mathrm{CO(g)} + \mathrm{H_2O(l)} \).
Recall that the equilibrium constant expression \( K \) is written in terms of the concentrations of the products over the reactants, each raised to the power of their stoichiometric coefficients.
Write the general form of the equilibrium constant expression: \[ K = \frac{[\text{products}]}{[\text{reactants}]} = \frac{[\mathrm{CO}]^{1} [\mathrm{H_2O}]^{1}}{[\mathrm{CO_2}]^{1} [\mathrm{H_2}]^{1}} \].
Recognize that since \( \mathrm{H_2O} \) is a liquid, its concentration is essentially constant and is omitted from the equilibrium expression.
Therefore, simplify the expression to: \[ K = \frac{[\mathrm{CO}]}{[\mathrm{CO_2}][\mathrm{H_2}]} \].
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