[Johulus]

Iron carbonyl complex is formed when carbon monoxide bonds to iron in hemoglobin. The formula of carbonyl complex is Fe_x(CO)_y. Determine empirical formula of complex if it is familiar that 0.1959 g of iron carbonyl complex incinerates in pure oxygen. In this process, 0.799 g of iron(III) oxide is formed and 2.2 g of carbon dioxide is released.

So what should I do?
I should somehow determine the ratio of amounts of these substances....
I was somewhere told that I should put these two in ratio....
n(Fe):n(Fe₂O₃)=2:1
and what about carbon monoxide?

[Hunter2]

You get iron oxide and carbon dioxide. Calculate the moles of both. Then these values reflect to the moles in the iron carbonyl. You can calculate the mass of both and compare with the used mass.