Question

Identify the mole ratio that can be derived from the following balanced chemical reaction: 4 Fe + 3 O2 --> 2 Fe2O3 a. 4 mol Fe/3 mol O2 b. 3 mol Fe/2 mol Fe2O3 c. 3 mol O2/3 mol Fe2O3 d. 2 mol O2/3 mol Fe2O3

Answer 1

To determine the mole ratio between two substances, all you need to do is look at the balanced equation for the coefficients in front of the substances you are interested in.

Answer: A

Answer 2

Answer: The mole ratio of $\frac{\text{4 mol Fe}}{\text{3 mol }O_2}$ is correct for the given chemical equation.

Explanation:

Mole ratio is defined as the ratio of number of moles of the two substances taken into account.

In a chemical reaction, the stoichiometric coefficients represents the number of moles.

For a given chemical equation:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

By stoichiometry of the reaction:

4 moles of iron metal reacts with 3 moles of oxygen gas to produce 2 moles of iron (III) oxide

Hence, the mole ratio of $\frac{\text{4 mol Fe}}{\text{3 mol }O_2}$ is correct for the given chemical equation.