Consider the voltaic cell below at 25 °C with 1.00 L of solution in each half-cell. When the switch — Electrochemistry Chemistry Question

Consider the voltaic cell below at 25 °C with 1.00 L of solution in each half-cell. When the switch is closed, the mass of the Cr(s) electrode increases until the cell is fully discharged (i.e., ΔE = 0 V). If the final mass of Cr(s) is 24.50 g, what is ΔE° at 25 °C for the reaction shown below?
2 Cr³⁺(aq) + 3 Zn(s) → 2 Cr(s) + 3 Zn²⁺(aq) ΔE° = ???