Plesase Help! Fe2O3 + CO → Fe + CO2

If 3 moles of Fe2O3 react with 1.5 moles of CO, how many moles of each product are formed?

1 mole of Fe and 1.5 moles of CO2
0.5 mole of Fe and 1 mole of CO2
6 moles of Fe and 9 moles of CO2
3 moles of Fe and 2 moles of CO2

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?