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Assuming that, water vapour is an ideal ...

Assuming that, water vapour is an ideal gas the internal energy `(Delta U)` when 1 mol of water is vapourised at 1 bar pressure and `100^(@)C` (given : molar enthalpy of vaporisation of water at 1 bar and `373 K = 41 kJ mol^(-1) and R = 8.3 J K^(-1) mol^(-1)`)) will be

A

`41.00kJ mol^(-1)`

B

`4.100kJ mol^(-1)`

C

`3, 790J mol^(-1)`

D

`37.9 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C, D
Reaction for the given condition is `H_(2)O_((l)) rarr H_(2)O_((g))`
`Delta H = Delta u + Delta n_((g)) RT`
`41 xx 10^(3) = Delta u + (1) xx 8.314 xx 373`
`Delta u = 37898.878 KJ = 37900KJ`
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