For the reaction with

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

For the reaction 2SO2(g)+O2(g)⇌2SO3(g)2\text{SO}_{2}(g)+\text{O}_{2}(g)\rightleftharpoons 2\text{SO}_{3}(g) with ΔH=−196 kJ\Delta H=-196\,\text{kJ}, which of the following changes would most strongly shift the equilibrium toward the formation of SO3\text{SO}_{3}? (a) Lowering the temperature from 600∘C600^{\circ}\text{C} to 400∘C400^{\circ}\text{C} at 1 atm1\,\text{atm} (b) Raising the temperature from 400∘C400^{\circ}\text{C} to 600∘C600^{\circ}\text{C} at 1 atm1\,\text{atm} (c) Reducing the pressure from 3 atm3\,\text{atm} to 1 atm1\,\text{atm} at 500∘C500^{\circ}\text{C} (d) Adding a platinum catalyst at 500∘C500^{\circ}\text{C} and 1 atm1\,\text{atm}

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