For the exothermic reaction ( )

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

For the exothermic reaction 2 SO2(g)+O2(g)⇌2 SO3(g)2\,\mathrm{SO_2(g)}+\mathrm{O_2(g)} \rightleftharpoons 2\,\mathrm{SO_3(g)} (ΔH∘=−198 kJ mol−1\Delta H^\circ = -198\,\text{kJ\,mol}^{-1}), a mixture is at equilibrium at 400\,K in a rigid vessel. Which temperature change will result in the greatest shift toward formation of SO3_3? (a) Decreasing the temperature from 400\,K to 300\,K (b) Increasing the temperature from 400\,K to 450\,K (c) Decreasing the temperature from 400\,K to 350\,K (d) Adding He gas at 400\,K until the total pressure doubles (volume constant)

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