计算下列物质的相对分子质量或相对分子质量之和: (1)氯气(Cl 2 ) (2)氯酸钾(KClO 3 ) (3)二氧化锰(MnO 2 ) (4)硫酸铵〔(NH 4 ) 2 SO 4 〕 (5)碱式碳酸铜〔Cu 2 (OH) 2 CO 3 〕 (6)蔗糖(C 6 H 12 O 6 ) (7)2CO 2 的相对分子质量之和.
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A.
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B.
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C.
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D.
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