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Calculate the change of entropy, Delta(r...

Calculate the change of entropy, `Delta_(r)S^(Theta)` at `298K` for the reaction in which urea is formed from `NH_(3)` and `CO_(2)`.
`2NH_(3)(g)+CO_(2)(g) rarr NH_(2)CONH_(2)(aq)+H_(2)O(l)`
The standard entropies `(J K^(-1)mol^(-1))` are:
`NH_(2)CONH_(2)(aq) =174.0, H_(2)O(l) = 69.9`
`NH_(3)(g) = 192.3, CO_(2)(g) = 213.7`

Text Solution

Verified by Experts

`Delta_(r)S^(Theta) = S^(Theta) (NH_(2)CONH_(2)) +S^(Theta) (H_(2)O) -[2S^(Theta)(NH_(3))+S^(Theta) (CO_(2))]`
`= 174.0 +69.9 -[2 xx 192.3 +213]`
`=- 354.4 J K^(-1) mol^(-1)`
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