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Answer» Characteristics of entropy: - Entropy is a thermodynamic state function that is a measure of the randomness or disorderliness of the system.
- In general, the entropy of gaseous system is greater than liquids and greater than solids. The symbol of entropy is S.
- Entropy is defined as “for a reversible change taking place at a constant temperature (T), the change in entropy (∆S) of the system is equal to heat energy absorbed or evolved (q) by the system divided by the constant temperature (T).
\(ΔS_{sys}\) = \(\frac{q_{rev}}{T}\) - If heat is absorbed, then ∆S is positive and there will be increase in entropy. If heat is evolved, ∆S is negative and there is a decrease in entropy
- The change in entropy of a process represented by ∆S and is given by the equation,
\(ΔS_{sys}\) =Sf - Si - If Sf > Si , ∆S is positive, the reaction is spontaneous and reversible.
- If Sf < Si , ∆S is negative, the reaction is nonspontaneous and irreversible.
- Unit of entropy: SI unit of entropy is J K-1
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