标准状况下,某气体的密度为1.25 g·L-1,则该气体的相对分子质量

标准状况下,某气体的密度为1.25 g·L1,则该气体的相对分子质量为  

A28          B28 g·mol1     C56 g·mol1         D56

答案

A

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