Standard Entropy

Standard Entropy:

The absolute entropy of a pure substance at 25°C (i.e., 298 K) and 1 atm pressure is termed as the standard entropy, S°. The standard entropies of each substance either elements or compounds at any temperature above 0°K always contain positive values.

Whenever the standard entropies, S° of different substances are identified, the standard entropy change of a chemical procedure or reaction is written as,

ΔS° = Σ S° products – Σ S° reactants

Here, ΔS° is the standard entropy change of the reaction.

Standard entropy change of formation, ΔS°f is stated as the entropy of formation of 1 mole of compound from the elements existed in the standard circumstances. ΔS°f can be computed for chemical compounds employing the S° values of elements from which the compound is made.

ΔS°f compound = ΣS°compound – Σ S°elements

 

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