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What is value of DeltaU for reversible i...

What is value of `DeltaU` for reversible isothermal 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)` cals

B

`6 xx 10^(3)` cals

C

`4.49` cals

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
D
Heat of system `(DeltaH)_(v) = m xx Lv`
`=90 xx 540 = 486000` cal
`DeltaH = DeltaE + P(V_(v)-V_(L)) = DeltaE + nRT`
or `48600 = DeltaE + 90/18 xx 2 xx 373`
or `DeltaE = 48600 - 3730 = 44870` cals
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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)

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