(A) If 12.3 g of Cu is deposited at the cathode of an electrolytic cell after 5.50 h, what was the current used?

(B) For how long would the electrolysis in Example 19-13 have to be carried out, using Pt electrodes and a current of 2.13 A, to produce 2.62 L O₂(g) at 26.2 °C and 738 mmHg pressure at the anode?

Example 19-13

The electrodeposition of copper can be used to determine the copper content of a sample. The sample is dissolved to produce Cu²⁺(aq), which is electrolyzed. At the cathode, the reduction half-cell reaction is Cu²⁺(aq) + 2 e^- → Cu(s). What mass of copper can be deposited in 1.00 hour by a current of 1.62 A?