题目:
对可逆反应N2 + 3H22NH3,下列描述能说明反应已达平衡的是 ( )
A.单位时间内有a mol N2消耗,同时生成2a mol NH3
B.氨气的浓度不再变化
C.容器内氮气、氢气、氨气的浓度之比为1︰3︰2
D.化学反应速率关系是:2v正(NH3) = 3v逆(H2)
答案:
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