单选题:设nA为阿伏伽德罗常数的数值,下列说法正确的是

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题目内容:
设nA为阿伏伽德罗常数的数值,下列说法正确的是 A.23g Na 与足量H2O反应完全后可生成nA个H2分子
B.1 molCu和足量热浓硫酸反应可生成nA个SO3分子
C.标准状况下,22.4LN2和H2混合气中含nA个原子
D.3mol单质Fe完全转变为Fe3O4,失去8nA个电子

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