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（1）含0.4mol A1 3+ 的Al 2 (SO 4 ) 3 中所含的SO 4 2- 的物质的量是_____________； （2）已知16g A和20g B恰好完全反应生成0.04mol C和31.76g D，则C的摩尔质量为 _____________； （3）如果ag某气体中含有的分子数为b，则cg该气体在标准状况下的体积是（设N A 为加德罗常数）____________________。
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A.
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B.
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C.
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D.
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