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DeltaH and DeltaS for the reaction Ag2O ...

`Delta`H and `DeltaS` for the reaction `Ag_2O (s) iff 2Ag(s)+ 1/2O_2(g)` are 30.56 kJ`mol^-1` and `66.0 JK^-1` respectively. Calculate the temperature at which the reaction would be at equilibrium. Also predict the direction of the reaction above this temperature.

A

483 K, spontaneous

B

443 K, non -spontaneous

C

463 K, spontaneous

D

463 K, spontaneous

Text Solution

Verified by Experts

The correct Answer is:
D
` Delta G =Delta H - T Delta S`
` " where " , Delta H = 30 . 558 kJK^(-1) mol ^(-1)`
` Delta S = 0.066 kJK^(-1) mol^(-1)`
`Delta G = 0`
`0= Delta H - T Delta S `
`Delta H = T Delta S `
` 30.558 = T xx 0.066`
` T = 463 K`
Reaction is non-spontaneous reason being ` Delta G =0 `.
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