1.

Delta H (vap) for water is 40.7 kJ mol^(-1). The entropy of vaporisation of water is :

Answer»

`- 40.7 kJ mol^(-1) K^(-1)`
`407 J mol^(-1) K^(-1)`
`109 J mol^(-1) K^(-1)`
`722 J mol^(-1)`

Solution :`DELTA S = (Delta_("vap") H)/(T_(b)) = (40.7 xx 10^(3))/(373)`
`= 109 JK^(-1) mol^(-1)`


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