Will the heat evolved be same in the following two cases? If not, in which case it will be greater and why? - Wired Faculty

Thermodynamics

Question

Will the heat evolved be same in the following two cases?
$left parenthesis straight i right parenthesis space straight H subscript 2 left parenthesis straight g right parenthesis space plus space 1 half straight O subscript 2 left parenthesis straight g right parenthesis space rightwards arrow space space space straight H subscript 2 straight O left parenthesis straight g right parenthesis$
$left parenthesis ii right parenthesis space straight H subscript 2 left parenthesis straight g right parenthesis space plus space 1 half straight O subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space space straight H subscript 2 straight O left parenthesis l right parenthesis$
If not, in which case it will be greater and why?

Solution

No, it will be greater in case (ii) because when H₂O(g) condenses to form H₂O(l), heat is released.

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