Practice question
Question
For 2A(g) <=> B(g) , Kc = 0.25 at 500 K. If 0.4 mol A is in a 2 L vessel, what is the degree of dissociation?
Explanation
Initial: [A] = 0.2 M , [B] = 0 . Let α be the degree of dissociation, [A] = 0.2 (1 - α) , [B] = 0.1α . Kc = ([B]/[A]²) = (0.1α/(0.2 - 0.2α)²) = 0.25 , α ≈ 0.36 .
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