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You can determine if a reaction is spontaneous by examining mainly two factors, the entropy and whether the reaction is exothermic or endothermic. Then by plugging in these values into the Gibss free energy equation, if the answer is negative, then the reaction is spontaneous.
The way I looked at this question was to say that if ice was melting, delta H was positive because you are putting heat into the system. Then you can say that delta s is positive because the molecules are going to have more possible positions in a liquid than in a solid. Then if the snow is melting, the temperature must be high enough for the entropy to overcome the enthalpy and cause the delta G to be negative.
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