0.9 g某元素的单质直接跟氯气反应后,质量增加了3.55 g,这种元素是(

0.9 g某元素的单质直接跟氯气反应后,质量增加了3.55 g,这种元素是(    )

A.P                        B.Mg                           C.Al                         D.Fe

答案

C

解析:设该金属为R,氯化物化学式为RClx。则

,代入检验可知该金属为Al。

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