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List the characteristics of entropy. |
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Answer» Solution :Characteristics of entropy: (i)Entropy is a thermodynamic state function that is a measure of the randomness or disorderliness of the system . (II)In general, the entropy of gaseous system is greater than liquids and greater The symbol of entropy is S. (iii)Entropy is defined as "for a reversible CHANGE TAKING place at a constant temperature (T), the change in entropy `(DeltaS)` of the system is equal to heat energy ABSORBED or evolved (q) by the system divided by the constant temperature (T). `DeltaS_"sys" =q_"rev"/T` (iv)If heat is absorbed , then `DeltaS` is positive and there will be increase in entropy . If heat is evolved , `DeltaS` is negative and there is a decrease in entropy . (v)The change in entropy of a process represented by `DeltaS` and is given by the equation, `DeltaS_"sys" =S_f-S_i` (vi)If `S_f > S_i , DeltaS` is positive , the reaction is spontaneous and reversible . If `S_f lt S_i , DeltaS` is negative , the reaction is non-spontaneous and irreversible . (vii) Unit of entropy :SI unit of entropy is `J K^(-1)` |
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