A gaseous reactant A forms two different product, in parallel reaction , B and C as follows:
`A rarr B, DeltaH^(@) =-3KJ, DeltaS^(@) = 20JK^(-1)" , " "A rarr C, DeltaH^(@) =-3.6KJ, DeltaS^(@) = 10 JK^(-1)`
Discuss the relative stability of B and C on the basis of Gibb's free energy change at `27^(@)C.`

Answer

`DeltaG^(@)` indicates that B is more stable than C.

Explanation

`A rarr B" "DeltaH^(@) =-3KJ " "DeltaS^(@)=20 J//KJ`
`A rarr C " "DeltaH^(@) =- 3.6 KJ " "DeltaS^(@)=10J//KJ`
`(i)` For `A rarr B , " " DeltaG = DeltaH -TDeltaS =- 3 -(300xx20)/(1000) =-9KJ =- 9000 J`
`(ii)` For `A rarr C , " " DeltaG =- 3.6-(300xx10)/(1000) =- 6.6 KJ =- 6600 J `
`DeltaG_(@) `Indicate that B is more stable than C.