In the balanced chemical reaction shown below, what is the molar ratio of Fe to Al?
Fe2O3(s) + 2Al(s) --> 2Fe (5) + Al2O3 (5)

Molar ratio of Fe to Al is 2:2.

Explanation:

Wherever we write the chemical equation it must be a balanced one and the states of all the reactants and products to be mentioned, so that the reaction can be clearly understood. To write the molar ratio of the one of the reactant and product, we have to use the balanced equation as, here 2  moles of Al is required to produce 2 moles of iron (Fe).

Fe₂O₃(s) + 2 Al(s) → 2 Fe(s) + Al₂O₃(s)

So the molar ratio of Fe to Al is 2:2.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.