I don't think the question is asking you to determine dGrxn. I think the question is asking, "Is the rxn spontaneous or not?" and the answer is yes it is. If you look at dStotal = dSsurr + dSrxn
dSrxn is + since liquid H2O has higher entropy than solid H2O and dsurroundings is q/T so dStotal is + and that means the reaction is spontaneous.
If you had observed the fate of an ice cube at 25 degrees Celsius, what would you conclude about the spontaneity of the process H2O (s) <-> H2O (l) ?
I know for it to be spontaneous, delta G has to be negative, but how can I determine the delta G with the info given in the question?
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