Practice question
Question
For the reaction 2AB(g) <=> A₂(g) + B₂(g) , if Kc = 0.0625 and [AB] = 0.5 M at equilibrium, what is [A₂] ?
Explanation
Let [A₂] = [B₂] = x , [AB] = 0.5 . Kc = ([A₂][B₂]/[AB]²) = (x²/(0.5)²) = 0.0625 . Solving, x² = 0.0625 × 0.25 = 0.015625 , x = 0.125 M .
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