From the following equations, calculate the standard molar heat of formation of AgCl at `25^(@)C`.
`Ag_(2)O(s)+2HCl (g) to 2AgCl(s)+H_(2)O(l), DeltaH^(0)=-77.61 kcal`
`2Ag(s)+(1)/(2)O_(2)(g) to Ag_(2)O(s), DeltaH^(0)=-73.1 kcal`
`(1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g) to HCl (g), DeltaH^(0)=-22.06 kcal`
`H_(2)(g)+(1)/(2)O(g) to H_(2)O(l),DeltaH^(0)=-68.32 kcal`

Answer

(-63.20 kcal)