题目内容

某温度时，反应Br2(g) + H2(g) = 2HBr(g)的KƟ = a，则反应HBr(g) = 1/2Br2(g) + 1/2H2(g)的KƟ为

A. 1/a
B. a
C. a -1/2
D. a1/2

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