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in Chemistry by (49.6k points)

Justify the following statements: 

(a) An exothermic reaction is always thermodynamically spontaneous.

(b) The entropy of a substance increases on going from liquid to vapour state at any temperature.

1 Answer

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(a) It is false. Exothermic process are not always spontaneous. If ΔS = -ve and TΔS > ΔH, the process will be non spontaneous even if it is exothermic. 

(b) The entropy of vapour is more than that of liquid therefore entropy increases during vaposisation.

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