Hess’s Cycle Question 4

The ΔH_fof AgCl is -120 kJ mol^-1.

If $Ag^+_{(aq)}+Cl^-_{(aq)}\rightarrow AgCl_{(s)} \: \: \: \Delta H:-127kJ \: mol^-^1$ , find the enthalpy change for the below equation:

$Ag_{(s)}+\frac{1}{2}Cl_{2(aq)}\rightarrow Ag^+_{(aq)}+Cl^-_{(aq)} \: \: \: \Delta H:\: ?kJ \: mol^-^1$ .

$clockwise = anticlockwise$

${\color{Red} x}{\color{Blue} -127} = {\color{Magenta} -120}$

$x=7kJ$