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Will the reaction, I(2)(s) +H(2)S(g) r...

Will the reaction,
`I_(2)(s) +H_(2)S(g) rarr 2HI(g) +S(s)`
proceed spontaneously in the forward direction of `298K`
`Delta_(f)G^(Theta)HI(g) = 1.8 kJ mol^(-1), Delta_(f)G^(Theta)H_(2)S(g) = 33.8 kJ mol^(-1)`?

Text Solution

Verified by Experts

`DeltaG^(Theta) = sum_(f)G^(Theta) ("products) -sum_(f)G^(Theta)("reactants")`
`=[2_(f)G^(Theta)HI(g) +._(f)G^(Theta)S(s)]- [1xx ._(f)G^(Theta)I_(2)(s) +._(f)G^(Theta)H_(2)S(g)]`
`= [2xx1.8 xx 0] -[0+33.8] =- 30.2 kJ`
`(-ve)` value shows that the process is spontaneous in forward direction.
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