I believe the bond between between F and Cl would be polar covalent.
Carbon, hydrogen, oxygen and nitrogen
Evaporation occurs when water molecules at the surface of a pool have enough kinetic energy that the attractive forces holding them to the liquid can be overcome
From the balanced chemical equation,
4Fe + 3O₂ --> 2Fe₂O₃
it is evident that for every 4 moles of Fe (iron), 2 moles of iron (III) oxide will be formed. Using the same ratio,
8 moles of iron x (2 moles Fe₂O₃ / 4 moles of Fe)
= 4 moles Fe₂O₃
Therefore, the answer is 4 moles.
True, Petroleum is used to make synthetic plastics and numerous petrochemical.