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What is value of DeltaU for reversible i...

What is value of `DeltaU` for reversible isothernal evaporation of `90g` water at `100^(@)C`? Assuming water vapour behaves as an ideal gas, `Delta_(vap. Water)H = 540cal g^(-1)`

A

`9 xx 10^(3) cal`

B

`6 xx 10^(3)cal`

C

`4.49 cal`

D

None of the above

Text Solution

Verified by Experts

Heat of system `(DeltaH)_(V) = m xx DeltaH`
`90 xx 540 = 48600 cal`
`DeltaH = DeltaU +P (V_(V) - V_(L)) = DeltaU + DeltanRT`
or `48600 = DeltaU +(90)/(18) xx2xx 373`
or `DeltaU = 48600 - 3730 = 44870 cal`
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