Question

metallic magnesium can be made by the electrolysis of molten MgCl2. how many minutes are needed to plate out 25g Mg from molten MgCl2 using 3.5 A of current?

Answer 1

56,522 seconds = 942 minutes

Step-by-step explanation:

n(Mg) = m/M(Mg) = 25 g / 24.31 g/mol = 1.03 mol of Mg

Q = n × 2 F = 1.03 mol × 2 × 96,485 C/mol = 197,820 C

t = Q / I = 197,820 C / 3.5 A = 56,522 s