APFIVE Reaction Quotient and Equilibrium Shift
Consider the reaction: $$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$$ with $$K_c = 2.8 \times 10^4$$ at 500 K. A mixture contains $$[SO_2] = 0.020\ \text{M}$$, $$[O_2] = 0.010\ \text{M}$$, and $$[SO_3] = 0.045\ \text{M}$$. Calculate the reaction quotient $$Q$$ and determine the direction the reaction must shift to reach equilibrium.
A
Q = 1.0 × 10^4; reaction proceeds backward
B
Q = 1.0 × 10^4; reaction proceeds forward
C
Q = 5.1 × 10^2; reaction proceeds forward
D
Q = 2.0 × 10^4; reaction proceeds backward
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