$($a$)$ Calculate the standard Gibbs free energy change in kJ$/$mol at $25$ C for the following reaction:

$3$ Sn$4+($aq$)+2$ Cr$($s$)3$ Sn$2+($aq$)+2$ Cr$3+($aq$)$

$($b$)$ Calculate the value of the equilibrium constant by relating it to $$G$$

$($c$)$ Calculate the value of the equilibrium constant by relating it to E$$cell.

$($d$)$ What ionic species are present in this solution at equilibrium, and what are their molar concentrations $($you do not need to calculate this using the equilibrium expression but rather just provide an estimate$)?$

$($e$)$ Tables of standard reduction potentials are usually given at $25$ C because E$$ cell is temperature$-$dependent. Compose an equation that describes the temperature dependence of E$$ cell. Hint: You need to consider both the entropy and enthalpy of the reaction to answer this correctly.