Why do boiling points differ between materials?

1 Answer
anor277
Jan 8, 2018

Because different liquids have different degrees of intermolecular force?

Explanation:

Let us take 2 common liquids: "(i) water; and (ii) diethyl ether...."

At 34.6 ""^@C, water has a vapour pressure of 41.1*mm*Hg...but at this temperature, diethyl ether has a vapour pressure of 760*mm*Hg. How did I know the latter? Because I know that at the "normal boiling point", the vapour pressure of the liquid is 1*atm-=760*mm*Hg. (How did I know the former? Well, I have got a handy table in front of me that tells me the vapour pressure of water at various temperatures.)

So a question for you to consider, what is the vapour pressure of water at 100 ""^@C?

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