How many moles of iron and carbonate ions are in iron (III) carbonate?

Question

the the question is how many moles of iron and carbonate ions are there in a molecule of Fe2(CO3)3?

Answer 1

The formula discribes the composition and when the atomic wts are all added they describe the gram-molecular wt of a mole of the formula; the subscripts tell how many moles of each element make up that formula mole. Thus, there are 2 moles of Fe, 3 moles of carbon, and 9 moles of oxygen. The 3 moles of carbon and the 9 moles of oxygen make up 3 sub-units of carbonate.

Answer 2

For every mole of Fe2(CO3)3 there are 2 moles of Fe and 3 moles of CO3