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Urea on hydrolysis produces ammonia and ...

Urea on hydrolysis produces ammonia and carbon dioxide. The standard entropies of urea, `H_(2)O, CO_(2), NH_(3)" are "173.8, 70, 213.5 and 192.5J" mole"^(-1)K^(-1)` respectively. Calculate the entropy change for this reaction.

Text Solution

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`S^(0)" (urea) =173.8 J mol"^(-1) K^(-1)`
`S^(0) (H_(2)O) =70" J mol"^(-1) K^(-1)`
`S^(0) (CO_(2)) =213.5" J mol"^(-1) K^(-1)`
`S^(0) (NH_(3)) =192.5" J mol"^(-1) K^(-1)`
`NH_(2) - CO - NH_(2) +H_(2)O to 2NH_(3) +CO_(2)`
`Delta S_(r)^(0) = Sigma (S^(0))_("products") - Sigma (S^(0))_("reactants")`
`Delta S_(r)^(0) = [2S^(0) (NH_(3)) +S^(0) (CO_(2))] - [S^(0)" (urea) "+S^(0) (H_(2)O)]`
`Delta S_(r)^(0) =[2xx192.5+213.5]- [173.8+70]`
`Delta S_(r)^(0) =[598.5]-243.8]`
`Delta S_(r)^(0) =354.7" J mol"^(-1) K^(-1)`
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