1.

Standard enthalpy of vapourisation Delta_("vap")H^(@) for water at 100^(@)C si 40.66 kJ mol^(-1). The internal energy of vaporization of water at 100^(@)C (in kJ mol^(-1)) is(Assume water vapour to behave like an ideal gas)

Answer»

`+37.56`
`-43.76`
`+43.76`
`+40.66`

SOLUTION :`DeltaH=DeltaE+Deltan(g)RT`
`40.66xx1000=DeltaE+(1)xx8.314xx373`
`DeltaE=37.56 kJ mol^(-1)`


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