A piston exering a pressure of one atm r...

A piston exering a pressure of one atm rests on the surface of water at `373K`. The pressure is reduced to smaller extent and as a result `10gm` of water evaporates and absorbs `22.4kJ` of heat. The change in internal energy is `:`

`19.678kJ`

`22.06kJ`

`23.943kJ`

`20.678kJ`

Text Solution

Verified by Experts

The correct Answer is:

`:' DeltaH=DeltaU+PDeltaV=DeltaU+Deltan_(g)RT`
`:. DeltaU=DeltaH-Deltan_(g)RT`
`=22.2-(10)/(18)xx8.314xx10^(-3)xx373`
`=20.678kJ`

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