Question

Assume the impure copper contains only iron, silver and a gold as impurities. After passage of 140 A, for 482.5 sec, of the mass of the anode decreased by 22.260 g and the cathode increased in mass by 22.011 g. Estimate the % iron and % copper originally present?

• A. $0.85$
• B. $6.22$
• C. $2.17$
• D. $1.12$

Answer 1

The correct option is D $1.12$

The percent of iron present is $\frac{22.260-22.011}{22.260}\times 100=1.119$ %