1.

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

Answer» Correct Answer - `Delta H = 48600 cal, Delta U = 44870cal`<br>`DeltaH = 540 xx 90 cal = 48600 cal, DeltaU = DeltaH - Deltan_(g)RT`,<br> `90 g H_(2) O = 5 ` moles , `Delta n_(g) = 5 ` for moles of `H_(2)O(l) rarr 5` moles of `H_(2)O(g)`


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