Practice question
Question
For the reaction X(g) + Y(g) <=> 2Z(g) , if Kc = 25 and at equilibrium [Z] = 0.5 M , what is [X] if [Y] = 0.02 M ?
Explanation
Kc = ([Z]²/[X][Y]) = 25 . Substituting, 25 = ((0.5)²/[X](0.02)) = (0.25/0.02 [X]) , 25 × 0.02 [X] = 0.25 , 0.5 [X] = 0.25 , [X] = 0.5 M .
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