Q for a forward and reverse reaction
2SO2(g) + O2(g) 2SO3(g)
Qc(fwd) = [SO3]2/[SO2]2[O2]
2SO3(g) 2SO2(g) + O2(g)
Qc(rev) = [SO2]2[O2]/[SO3]2 = 1/Qc(fwd)
Thus: Qc(fwd) = (Qc(rev))-1 and Kc(fwd) = (Kc(rev))-1
Kc(fwd) = 261 and Kc(rev) = 1/261 = 3.83 x 10-3 (at 1000 K)
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