A liquid has a vapour pressure of 40mm H...

A liquid has a vapour pressure of 40mm Hg at `19.0^(@)C` and a normal boiling point of `78.3^(@)C` What is its enthalpy of vaporization in KJ .`mol^(-1)`?

A

A only

B

A and B only

C

A and C only

D

A, B and C

Text Solution

Verified by Experts

The correct Answer is:

B

The temperature shown by vapour pressure curve at atmospheric pressure is the boiling temperature `(T_(b)^(0))` of the liquid

There is a break in the (otherwise) smooth curve of vapour pressure, which shows the freezing point temperature.

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