1.

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

Answer»

`4.100 KJ mol^(-1)`
`3.7904 kJ mol^(-1)`
`37.904 kJ mol^(-1)`
`41.00 kJ mol^(-1)`

Solution :`H_(2)O(l)OVERSET("vaporization")rarrH_(2)O(g)`
`Deltan_(g)=1-0=1`
`DeltaH=DeltaH+Deltan_(g)RT`
`=41-8.3xx10^(-3)xx373=37.9 kJ mol^(-1)`


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