Given these standards reduction potentials, what is the free energy change (in kJ. Mol^(-) for the reaction:
`Pb(s) + 2Ag^(+)(aq) rightarrow Pb^(2+)(aq) + 2Ag(s)`
`Ag^(+)(aq) + e^(-) rightarrow Ag(s)` `E^(@) = 0.80V`
`Pb^(2+)(aq) + 2e^(-) rightarrow Pb(s)` `E^(@) = -0.13V`
A. -180
B. -90
C. 90
D. 180