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硫化氢和氯化氫的沸点谁高？

返回打印发布时间：2022/12/2 点击：22841

硫化氢和氯化氫都是分子晶体，但是硫化氢的沸点比氯化氫的沸点要高。

硫化氢的沸点高于氯化氫的沸点主要原因是:

1、硫化氢的相对分子量大于氯化氫的相对分子量。

2、硫和氯是同一时期的元素。硫的分子量小于氯，但硫是第六主族，氯是第七主族。硫化氢中的硫以负二价形式存在，氯化氫中的氯以负一价形式存在。所以，在固态和液态下，硫化氢的氢键数量都比氯化氫多得多。即使氯化氫的分子量比硫化氢略大，但显然氢键对熔点和沸点的影响更大。

3、硫的非金属性比氯强，形成的气态氢化物更稳定。

综上所示，所以硫化氢的沸点比氯化氫的沸点高。

下一篇: 液态氯化氫是电解质吗？

上一篇: 为什么要用氯化氫气流而不是氯化氫气氛来制备氯化镁？

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