Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

The reaction below is part of the Contact process. $2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g) \quad \Delta H^\circ = -197\,\text{kJ mol}^{-1}$ This reaction is studied at $200\,\text{kPa}$ and $700\,\text{K}$, and the equilibrium constant, $K_p$, is determined to be $Y$. It is then studied again at $1000\,\text{kPa}$ and $700\,\text{K}$, and the value of $K_p$ is found to be $Z$. Which statement about the comparison between $Y$ and $Z$ is correct?

  • A$Y$ and $Z$ are the same.
  • B$Y$ is greater than $Z$.
  • C$Z$ is $2.2$ times greater than $Y$.
  • D$Z$ is $5.0$ times greater than $Y$.

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI