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To expand, if a reaction is spontaneous, it can occur more easily and often so it would be more favorable than a reaction that requires a specific environment and has a more difficult proceeding.
when deltaG is negative, that means deltaS of the universe (total) is positive since deltaS(total)=-(deltaG)/T. deltaS being positive means the reaction is spontaneous (thus deltaG needs to be negative)
A negative value for Gibb's free energy indicates that no energy is needed to be added to the system to have the reaction occur spontaneously. Therefore, the reaction is spontaneous. If it was a positive value, that indicates that that quantity of energy must be added in order for the reaction to occur spontaneously, and therefore, it is not spontaneous.
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