The number of moles of iodine that can be made from 16.4 grams of NaIO3 is calculated as below
calculate the moles of the molecules
moles= mass/molar mass = 16.4g/197.89 g/mol= 0.082 moles
since we have 1 atom of Iodine in NaIO3 the moles of iodine =0.082 moles