A gaseous mixture of hydrogen gas and iodine gas is contained in a reaction vessel with volume $V$ at temperature $T$. The reaction $\text{H}_2 + \text{I}_2 \rightleftharpoons 2\text{HI}$ is then allowed to reach equilibrium. Every substance stays in the gaseous state. Argon gas is next introduced into the reaction vessel. The temperature inside the vessel is kept at $T$. What happens to the rate of the forward reaction and the partial pressure of HI at equilibrium?
- Arate increased, partial pressure increased
- Brate increased, partial pressure unaffected
- Crate unaffected, partial pressure increased
- Drate unaffected, partial pressure unaffected