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【单选题】
N A 表示加德罗常数，下列判断正确的是A.
含N A 个Na + 的Na 2 O溶解于1L水中，Na + 的物质的量浓度为1mol·L -1
B.
100mL Imol·L -1 AlCl 3 溶液中含的阳离子数大于0.1N A
C.
标准状况下，22.4L二氯甲烷的分子数为N A
D.
含0.2mol H 2 SO 4 的浓硫酸与足量的铜反应，生成的SO 2 的分子数为0.1N A
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