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The vapour pressure of phoshorus trichor...

The vapour pressure of phoshorus trichoride is100 mm Hg at `21.0^(@)` and its normal boiling point is `74.2^(@)` C What is the enthalpy of vaporization in KJ `.mol^(-1)`

A

`0.493`

B

`3.93`

C

`23.0`

D

`32.4`

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d
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