Le Chatelier's Principle — Prelims Questions

Consider the following reversible reaction at equilibrium: \n$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$, $\Delta H = -197 \text{ kJ/mol}$. \nWhich of the following changes will increase the yield of $SO_3$?

For the reaction $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$, $\Delta H = +92.5 \text{ kJ/mol}$. Which of the following conditions would favor the dissociation of $PCl_5$?

For the reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$, which of the following statements is INCORRECT?

For the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, $\Delta H = -92.4 \text{ kJ/mol}$. If the volume of the container is suddenly halved at constant temperature, what will be the immediate and long-term effect on the concentration of $NH_3(g)$?

Consider the following equilibrium: \n$A(s) + B(g) \rightleftharpoons C(g) + D(g)$, $\Delta H > 0$. \nWhich of the following changes will shift the equilibrium to the left?

For the reaction $2NO(g) + O_2(g) \rightleftharpoons 2NO_2(g)$, $\Delta H = -114 \text{ kJ/mol}$. If the temperature of the system is increased, which of the following statements is true?

For the reaction $CO(g) + Cl_2(g) \rightleftharpoons COCl_2(g)$, what is the effect of adding a catalyst to the system at equilibrium?