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    【题目】在实验室测定空气中氧气的含量实验，能否用硫代替红磷？为什么？

    ________________________________________________________________________。

    【答案】不能用硫代替红磷，因为硫在空气中生成的二氧化硫是气体，不能使集气瓶内的气压减小

    【解析】

    试题分析：因为硫在空气中生成的二氧化硫是气体，不能使集气瓶内的气压减小所以不能用硫代替红磷。

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