What is the percentage of iodine in zinc iodate zn(io3)2

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution