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For H2 + I2 to 2HI (Kc = 57.0), a mix has [H2] 0.10 M, [I2] 0.20 M, [HI] 0.40 M. Qc is
A0.125
B8.0
C20
D57
Answer & Solution
Correct answer: B. 8.0
Qc = (0.40)^2 / (0.10 x 0.20) = 0.16 / 0.02 = 8.0, which is below Kc so it moves forward.
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