4.Calculate the cell potential for the following reaction and determine if will be spontaneous. 2 \mathrm{Na}^{+}(\mathrm{aq})+\mathrm{Sn}_{(\mathrm{s})} \rightarrow 2 \mathrm{Na}_{(s)}+\mathrm{Sn}^{2+}_{\text {(aq) }}