Determinethe value of DeltaH and DeltaU for the reversible isothermal evaporationof 90.0 gof water at 100^(@)C . Assume that water vapour behave as an ideal gas and heatof evaporationof water is 540 cal g^(-1)( R = 2.0 cal mol^(-1)K^(-1))

Determinethe value of DeltaH and DeltaU for the reversible isothermal

1.	Determinethe value of DeltaH and DeltaU for the reversible isothermal evaporationof 90.0 gof water at 100^(@)C . Assume that water vapour behave as an ideal gas and heatof evaporationof water is 540 cal g^(-1)( R = 2.0 cal mol^(-1)K^(-1))
Answer» Solution :`DeltaH = 540 xx 90 cal = 48600 cal, DeltaU = DeltaH - Deltan_(G)RT`, `90 g H_(2) O = 5 ` MOLES , `Deltan_(g) = 5 ` for MOLESOF `H_(2)O(l) rarr 5` moles of `H_(2)O(g)`