To determine the amount of iron in a dietary supplement, a random sample of 15 tablets weighing a total of 20.505 g was ground into a fine powder. A 3.116-g sample was dissolved and treated to precipitate the iron as Fe(OH) 3. The precipitate was collected, rinsed, and ignited to a constant weight as Fe 2 O 3 , yielding 0.355 g. Report the iron content of the dietary supplement as g FeSO 4 •7H 2 O per tablet.