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 Fe2O3, yielding 0.355 g. Report the iron content
of the dietary supplement as g FeSO4•7H2O per tablet
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