2Na+ + 2СГ -> 2Na(Hg) + Cl2 (aqueous)
is not spontaneous. The standard free energy change for this reaction can be calculated using the equation:
ΔG° = ΣΔG°f(products) - ΣΔG°f(reactants)
Given that the standard free energy of formation of Na(Hg) is -85 kJ/mol, we can substitute the values into the equation to find the standard free energy change.
From a thermodynamic standpoint, another reaction should occur more readily at the cathode of your cell. The specific reaction is not mentioned in the provided text.