(Solved): 4. Calculate the cell emf for the following reaction at \( 25^{\circ} \mathrm{C} \) : \( [3 \mathrm ...

4. Calculate the cell emf for the following reaction at \( 25^{\circ} \mathrm{C} \) : \( [3 \mathrm{pts}] \) \( (1.0 \mathrm{M}) \) \[ \mathrm{Ni}(\mathrm{s})+2 \mathrm{Cu}^{\prime}(0.010 \mathrm{M}) \circledast \mathrm{Ni}^{\prime}(0.0010 \mathrm{M})+2 \mathrm{Cu}^{\prime} \] 5. How long must a constant current of \( 40.0 \mathrm{~A} \) be passed through an electrolytic cell containing aqueous \( \mathrm{Zn} 2+ \) ions to produce \( 2.50 \) moles of zinc metal? [3 pts]