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Entropy is that thermodynamic quantity that is associated with representing non-availability of thermal energy in a system for conversion into mechanical energy that is termed as a disorder in the system. The entropy changes that are there in a specific system is specifically driven by heat flow as well as signs are determined by that.

When exothermic reactions are taken into consideration, there is a constant temperature within the system that would cause heat to flow into the surrounding area and thereby ensure that the surrounding is rendered positive.

When any such system and its surroundings come across each other in irreversible process, there is an increase in entropy. When entropy of one increases, entropy of another decreases. So, it is taken that this change in entropy in an irreversible process is greater than zero, while in reversible process it is less than zero.

Entropy Change in an Irreversible Process

Entropy Change in an Irreversible Process 2” = C

Thus, the equation of entropy for different processes

Entropy Change in an Irreversible Process 3” = C

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