KCET 2014 Chemistry Solved Paper

Impure copper containing Fe, Au, Ag as impurities is electrolytically refined. A current of 140 A for 482.5 s decreased the mass of the anode by 22.26 g and increased the mass of cathode by 22.011 g. Percentage of iron in impure copper is
(Given molar mass Fe = 55.5 g mol−1, molar mass Cu = 63.54 g mol−1)