單項選擇題在某溫度下,反應(yīng)1/2N2(g)+3/2H2(g)=NH3(g)的平衡常數(shù)K=a,上述反應(yīng)若寫成2NH3(g)=N2(g)+3H2(g),則在相同溫度下反應(yīng)的平衡常數(shù)為:()

A.a/2
B.2a
C.a2
D.1/a2


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