题干

某化学兴趣小组的同学用过氧化氢溶液中加入二氧化锰的方法制取氧气,以下是他们实验时记录的相关数据:

反应前物质的质量/g

充分反应后物质的质量/g

过氧化氢溶液

二氧化锰

固体与液体混合物质量

68.0

0.1

66.5

请计算:

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