CHEM_
posted by Sienna .
if 16.5 of iron (II) sulfide contain 6.02 x 10^23 formula units, how many formula units of iron (II) sulfide are in 1.00 mL of iron (II) sulfide? The density of iron (II) sulfide is 4.84 g/cm^3

I can tell you without any work at all that 16.5 grams of FeS does not contain 6.02 x 10^23 formula units of FeS.