在两个容积相同的容器中,一个盛有NH3,另一个盛有N2、H2的混合气

在两个容积相同的容器中,一个盛有NH3,另一个盛有N2、H2的混合气体,在同温同压下,两容器内的气体一定具有相同的          (    )

A.原子数         B.分子数          C.质量           D.密度

答案

B

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