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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

42.4

B

18.4

C

`5.10`

D

1.45

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