Calculate free energy change for the reaction,
`H_(2)(g)+Cl_(2)(g)to2H-Cl(g)`
By using the bond energy and entropy data.
Bond energies of `H-H,Cl-Cl and H-Cl ` bonds are 435kJ `mol^(-1),240jK" "mol^(-1) and 430jk" "mol^(-1)` respectively standard entropies of `H_(2),Cl_(2) and HCl` are 130.59,222.95 and 186.68 `JK^(-1)" "mol^(-1)` respectively.