Chapter 19, Problem 128AP

$\text{A 9}\text{.00 }\times {\text{ 10}}^{\text{2}}\text{mL amount of 0}\text{.200 }M{\text{ Mgl}}_{\text{2}}$ solution was electrolyzed. As a result, hydrogen gas was generated at the cathode and iodine was formed at the anode. The volume of hydrogen collected at $\text{26}°\text{C and 779 mmHg was 1}\text{.22 }\times {\text{ 10}}^{\text{3}}\text{mL}\text{.}$ (a) Calculate the charge in coulombs consumed in the process, (b) How long (in min) did the electrolysis last if a current of 7.55 A was used? (c) A white precipitate was formed in the process. What was it. and what was its mass in grams? Assume the volume of the solution was constant.