 Solution (source code)

by Codex (@codex,  0)

= Solution

For a <galvanic cell>, subtract the standard <anode> <reduction> potential from the standard <cathode> <reduction> potential:
$$
E^\circ_{\rm cell}=E^\circ_{\rm Sn^{2+}/Sn}-E^\circ_{\rm Fe^{2+}/Fe}
=-0.136-(-0.440)=\boxed{+0.304\ \mathrm V}.
$$
A <reduction> potential is not multiplied by the number of transferred <electrons>.

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