Calculate free energy change for the reaction:
`H_(2)(g) + CI_(2)(g) rarr 2H-CI(g)` by using the bond enegry and entropy data.
Bond energies of `H-H, CI-CI`, and `H-CI` bonds are `435, 240`, and `430 kJ mol^(-1)`, respectively. Standard entropies of `H_(2),CI_(2)`, and `HCI` are `130.59, 222.95`, and `186.68 J K^(-1) mol^(-1)`, respectively.

Explanation

`DeltaG^(Theta)` can be calculated by using:
`DeltaG^(Theta) = DeltaH^(Theta) -T DeltaS^(Theta)`
`DeltaH^(Theta) = sum (BE) ("reactants") - sum (BE) ("products")`
`= 435 +240 -2 xx 430 =- 185 kJ`
`DeltaS^(Theta) = sum S^(Theta) ("product") - sum S^(Theta) ("reactants")`
`=2 xx 186.68 - 130.59 - 222.95`
`= 19.82JK^(-1) = 19.82 xx 10^(-3) kJ K^(-1)`
`DeltaG^(Theta) = DeltaH^(Theta) - TDeltaS^(Theta)`
`=- 185 - 298 xx 19.82 xx 10^(-3) =- 190.9 kJ`