Question

Review Constants 1 Periodic Table Part A Metal plating is done by passing current through a metal solution. For example, an item can become gold plated by attaching the item to a power source and submerging it into a Au' solution. The item itself serves as the cathode, at which the Au't ions are reduced to Au(s). A piece of solid gold is used as the anode and is also connected to the power source, thus completing the circuit. What mass of gold is produced when 24.5 A of current are passed through a gold solution for 26.0 min? Express your answer with the appropriate units. View Available Hint(s) MÅ MO O ? mass of Au = Value Units Submit

Answer 1

Charge passed through the solution = Current * time in seconds = 24.5 * 26 * 60 = 3.822 * 104 C

Each mole of Au formed needs 3 * 1F = 3 * 96500 C = 2.895 * 105 C

Moles of Au deposited = Charge / charge per mole = 3.822 * 104 / (2.895 * 105) = 0.132 moles

mass of Au = moles * molar mass = 0.132 * 197 = 26.00 g