What is the charge on an ion of tin if $7.42 \mathrm{g}$ of metallic tin is deposited by passage of $24125 \mathrm{C}$ through a solution containing the ion?

Nickel metal is added to a solution containing $1.0 \mathrm{M} {\mathrm{Pb}}^{2+} \left(\mathrm{aq}\right)$ and $1.0 \mathrm{M} {\mathrm{Cd}}^{2+}\left(\mathrm{aq}\right)$. Use the standard reduction potential to determine which of the following reaction (s) will occur.

Reaction $1$: ${\mathrm{Ni}}_{\left(\mathrm{s}\right)}+{\mathrm{Pb}}^{2+}\left(\mathrm{aq}\right)\to {\mathrm{Pb}}_{\left(\mathrm{s}\right)}+{\mathrm{Ni}}^{2+}\left(\mathrm{aq}\right)$

Reaction $2$: ${\mathrm{Ni}}_{\left(\mathrm{s}\right)}+{\mathrm{Cd}}^{2+}\left(\mathrm{aq}\right){\mathrm{Cd}}_{\left(\mathrm{s}\right)}+{\mathrm{Ni}}^{2+}\left(\mathrm{aq}\right)$

Reactions: ${\mathrm{Pb}}^{2+}\left(\mathrm{aq}\right)+2\mathrm{e}={\mathrm{Pb}}_{\left(\mathrm{s}\right)} \mathrm{E}°=-0.13 \mathrm{V}$
${\mathrm{Ni}}^{2+}\left(\mathrm{aq}\right)+2\mathrm{e}={\mathrm{Ni}}_{\left(\mathrm{s}\right)} \mathrm{E}°=-0.23 \mathrm{V}$

${\mathrm{Cd}}^{2+}\left(\mathrm{aq}\right)+2\mathrm{e}={\mathrm{Cd}}_{\left(\mathrm{s}\right)} \mathrm{E}°=-0.40 \mathrm{V}$

An electrochemical cell constructed for the reaction :

${\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)+{\mathrm{M}}_{\left(\mathrm{s}\right)}\to {\mathrm{Cu}}_{\left(\mathrm{s}\right)}+{\mathrm{M}}^{2+}\left(\mathrm{aq}\right)$ has an $\mathrm{E}°=0.75 \mathrm{V}$. The standard reduction potential for ${\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)$ is $0.34 \mathrm{V}$. What is the standard reduction potential for ${\mathrm{M}}^{2+}\left(\mathrm{aq}\right)$?