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In order to account for the fact that energy is conserved, we must include entropy because some energy will be lost as entropy. Also, whether or a reaction increases or decreases entropy can have a effect on whether or not it is spontaneous.
Entropy is a degree of disorder. We need both the change in entropy and the change in internal energy to be able to fully describe how a system will change. We need entropy because its degree would allow us to determine how spontaneous something is.
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