Practice question
Question
For A(g) + 2B(g) <=> 2C(g) , if Kc = 4 and [C] = 0.8 M , [B] = 0.4 M at equilibrium, what is [A] ?
Explanation
Kc = ([C]²/[A][B]²) = 4 , 4 = ((0.8)²/[A](0.4)²) = (0.64/[A] × 0.16) , 4 × 0.16 [A] = 0.64 , 0.64 [A] = 0.64 , [A] = 1.0 M .
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