Rank the following compounds in order of decreasing boiling point: potassium fluoride (KF), acetylene (C2H2), and iodomethane (CH3I)?

[匿名]

2015-09-04 5:31 pm

回答 (3)

賣女孩的火柴

2015-09-04 5:43 pm

✔ 最佳答案

boiling point: KF > CH₃I > C₂H₂

Explanation :

Potassium fluoride (KF) is an ionic compound and the opposite ions are held together by strong electrostatic forces, while the other two compounds are molecular and the molecules are held together by weak van der Waals' forces. Therefore, KF has the highest boiling point.

As iodine (I) is large atom. CH₃I has a greater molecular size than C₂H₂. Therefore, the van der Waals' forces between CH₃I molecules are stronger than those between C₂H₂. As a result, CH₃I has a higher boiling point than C₂H₂.

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[匿名]

2015-09-04 5:34 pm

C2H2 , CH3I, KF

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[匿名]

2015-09-04 5:48 pm

Ever heard of the CRC handbook of Chemistry, and Physics?

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