下列说法正确的是 ( )
A．1 g水中含有1 mol H2O
B．CO和N2的摩尔质量都是28
C．1 mol SO2的质量是64 g
D．CO和N2的摩尔体积都约为22.4 L·mol－1
答案：C
题目分析：A：水的摩尔质量是18g/mol,1g水含有1/18molH2O；B：摩尔质量的单位是g/mol，B错；C：SO2的摩尔质量为64g/mol，所以1molSO2的质量是64g；D：气体在标准状况下（101KPa，25℃），气体摩尔体积约为22.4 L·mol－1
点评：易错点：摩尔质量有单位g/mol；气体摩尔体积要注意条件。
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