Chad's questions: Please Help

[stpele01]

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For water,deltaH(vap) is 40.67KJ/mol What is deltaS(vap) for water?



The answer is 109 J/K

mol
Why is the temperature 373K here?

 

[quocstazz]

For water,deltaH(vap) is 40.67KJ/mol What is deltaS(vap) for water?



The answer is 109 J/K

mol
Why is the temperature 373K here?

Using deltaG = deltaH - TdetalS
During evaporation, you are at equilibrium so deltaG is 0. As a result, you'd end up with detalH= TdeltaS.

Since you want delta S, you get S on one side and get delta S = deltaH/T
water boils at 100C so convert that to kelvin and you should get 373K

cheers

 

[stpele01]

Thank you so much for the explanation. Makes so much sense now.