Why do boiling points differ between materials?

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Why do boiling points differ between materials?

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Answer 1 · 2018-01-08T16:10:27

Because different liquids have different degrees of intermolecular force?

Explanation:

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

At $34.6$ $34.6$ $^{\circ} C$ $""^@C$ , water has a vapour pressure of $41.1 \cdot m m \cdot H g$ $41.1*mm*Hg$ ...but at this temperature, diethyl ether has a vapour pressure of $760 \cdot m m \cdot H g$ $760*mm*Hg$ . How did I know the latter? Because I know that at the $normal boiling point$ $"normal boiling point"$ , the vapour pressure of the liquid is $1 \cdot a t m \equiv 760 \cdot m m \cdot H g$ $1*atm-=760*mm*Hg$ . (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 $100$ $100$ $^{\circ} C$ $""^@C$ ?

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Why do boiling points differ between materials?

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