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Standard enthalpy of vaporisation Delta(...

Standard enthalpy of vaporisation `Delta_("vap")H^(@)` for water at `100^(@)`C is `40.66 KJ "mol"^(-1)` . The internal energy of vaporisation of water at `100^(@)C` (in KJ `"mol"^(-1)`) is (assume water vapour to behave like an ideal gas).

A

`+43.76`

B

`+40.66`

C

`+37.56`

D

`-43.76`

Text Solution

Verified by Experts

The correct Answer is:
C
`H_(2)O_((l))rarr H_(2)O_((g))`
`Delta H=Delta E+Delta` ng. RT
`40.66=Delta E+1xx8.314xx373xx10^(-3)`
`therefore Delta E=37.56 kJ mol^(-1)`
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