A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore?

Question

A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore?
Answer in units of g.

DrBob222 · Answer

21.3 g Fe2O3 x (2*atomic mass Fe/molar mass Fe2O3)= ? You don't need the mass of the sample of 12.8 grams. That would be needed only if you wanted % Fe in the sample.