Q 1115623560.     Assuming that water vapour is an ideal gas, the internal energy change `(U)` when `1` mol of water is vapourised at `1` bar pressure and

`100^@C` will be:

(Molar enthalpy of vapourisation of water at 1 bar and `373 K = 41 kJmol^-1 and R = 8.3 J moI^-1 K^-1`)

JEE 2007
A

`4.100 kJmol^-1`

B

`3.7904 kJmol^-1`

C

`37.904kJmol^-1`

D

`41.000 kJmol^-1`

HINT

Use `H=U+PV`

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