Consider the equilibrium at a temperature where

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

Problem

Consider the equilibrium 2SO2(g)+O2(g)⇌2SO3(g)2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g) at a temperature where Kp=3.0K_p = 3.0. A sealed container initially at equilibrium is disturbed so that the partial pressures become PSO2=1.5 atmP_{\text{SO}_2}=1.5\,\text{atm}, PO2=0.50 atmP_{\text{O}_2}=0.50\,\text{atm}, and PSO3=2.0 atmP_{\text{SO}_3}=2.0\,\text{atm}. What will be the net direction of the reaction as the system re-establishes equilibrium? (a) No net change will occur because the disturbance does not affect QpQ_p. (b) It will shift toward products because the calculated QpQ_p exceeds KpK_p. (c) It will shift toward reactants because the calculated QpQ_p exceeds KpK_p. (d) It will shift toward products because the calculated QpQ_p is less than KpK_p.

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