0.500 mol of Ca(IO3)2 contains ------ mol of iodine, I; to supply this much iodine,----- g of calcium iodate are needed. [Iodised salt contains a trace amount of calcium iodate, Ca(IO3)2, to help prevent a thyroid condition called goitre.]

Answer 1

0.500 mole Ca(IO3)2 x (2 moles I/1 mole Ca(IO3)2).
Now convert moles to grams. g I = moles I x atomic mass I.