The degree of randomization rises as the volume and as a result, entropy likewise increases, giving us S=+ve. As the pressure is increased, the system's entropy drops, resulting in S=ve
As would be predicted from a combustion reaction in which a single big hydrocarbon molecule is broken down into several molecules of gaseous products, S° is positive. Because solids have less entropy than liquids, the freezing of water results in a decrease in entropy, and as a result, it has the smallest Delta S. The other two possibilities would result in more entropy. Entropy is greatly increased during the sublimation of ice because gas has a higher entropy than solids.
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