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delta S total is the total entropy change that occurs during a reaction, while delta G is the total change in gibbs free energy that dictates if the reaction is spontaneous or not. In order to solve for delta G, we can often use delta S in the equation, delta G= deltaH -Tdelta S
Depending on the signs of delta H and delta S, the sign of delta G will be positive or negative and we can therefore determine if a reaction is spontaneous or not. To guarantee spontaneity we need delta H to be negative and delta S to be positive.
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