Calculate the standard free energy change ( ) for the following chemical reaction: Given: ,

Calculate the standard free energy change ($\Delta G^\circ$) for the following chemical reaction: $\text{Cd}(s) + 2\text{Ag}^+ \longrightarrow \text{Cd}^{2+} + 2\text{Ag}(s)$ Given: $E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0\cdot40\text{ V}$, $E^\circ_{\text{Ag}^+/\text{Ag}} = +0\cdot80\text{ V}$