Consider the following cell notation: 
Mg(s) | Mg²⁺(aq) || Cu²⁺(aq) | Cu(s)Determine the Mg²⁺:Cu²⁺ concentration ratio at 25.0 °C if the cell potential is measured to be 2.74 V. (E°_red,Mg2+ = −2.37 V; E°_red,Cu2+ = 0.34 V)