Chemistry HW help

Question

What mass of Au, in grams, will be deposited from a Au+ (aq) solution in an electrolytic cell that operates at 52.0 A for 1.00

hour? (F = 96500 C/mol)

Answer 1

Au⁺(aq) + e- ==> Au(s)

52.0 amps = 52.0 Coulombs(C) / sec

52.0 C / sec x 60 sec / min x 60 min / hr = 187,200 C in the 1 hour

moles of electrons = 187,200 C x 1 mol e- / 96,500 C = 1.94 moles of electrons

moles of Au⁺ converted to Au(s) = 1.94 mol e- x 1 mol Au / mol e- = 1.94 moles Au

mass of Au deposited = 1.94 mols Au x 197 g / mol = 382 g Au