AP Chemistry
7.10 Reaction Quotient and Le Châtelier’s Principle
7.3 Reaction Quotient and Equilibrium Constant
A student investigates the gas-phase synthesis of phosgene according to the following balanced equation:
\[ \text{CO}(g) + \text{Cl}_2(g) \rightleftharpoons \text{COCl}_2(g) \]
At \(500 \text{ K}\), the equilibrium constant \(K_c\) for the reaction is \(5.0\). The student measures the initial concentrations of the gases in a rigid container at \(500 \text{ K}\) and records the data in the table below.
Which of the following correctly compares the reaction quotient, \(Q_c\), to \(K_c\) and describes the relative rates of the forward and reverse reactions immediately after mixing?
\[ \text{CO}(g) + \text{Cl}_2(g) \rightleftharpoons \text{COCl}_2(g) \]
At \(500 \text{ K}\), the equilibrium constant \(K_c\) for the reaction is \(5.0\). The student measures the initial concentrations of the gases in a rigid container at \(500 \text{ K}\) and records the data in the table below.
| Species | Initial concentration (M) |
|---|---|
| \(\text{CO}(g)\) | \(0.10\) |
| \(\text{Cl}_2(g)\) | \(0.20\) |
| \(\text{COCl}_2(g)\) | \(0.30\) |
Which of the following correctly compares the reaction quotient, \(Q_c\), to \(K_c\) and describes the relative rates of the forward and reverse reactions immediately after mixing?
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