What is the value ofDeltaE(heat change a...

What is the value of`DeltaE`(heat change at constant volume)for reversible isothermal evaporation of `90g`water at `100^(@)C`Assuming water vapour behaves as an ideal gas and`(DeltaH_("vap"))_("water")=540calg^(-1)`

`9xx10^(3)cal`

`6xx10^(3)cal`

`4.49cal`

none of these

Text Solution

Verified by Experts

The correct Answer is:

Heat of system `(DeltaH)_(v)=mxxLv`
`=90xx540=486000cal`
`DeltaH=DeltaE+P(V_(v)-V_(L))=DeltaE+nRT`
or, `48600=DeltaE+(90)/(18)xx2xx373`
0r, `DeltaE48600-3730=44870cal`

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