Verified 30 May 2026.
For the reaction $2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g)$, $\Delta H = -198 \text{ kJ}$. Which condition favours the forward reaction?
High temperature and low pressure
Low temperature and high pressure
High temperature and high pressure
Low temperature and low pressure
Applying Le Chatelier's Principle:
$$2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g), \quad \Delta H = -198 \text{ kJ}$$
Temperature: $\Delta H < 0$ (exothermic) → low temperature favours forward.
Pressure: $\Delta n_g = 2 - 3 = -1$ → high pressure favours forward.
$$\boxed{\text{Low temperature and high pressure}}$$
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