Question

Assume 3 molecules of Fe react according to the following equation.

3Fe + 4H2O Fe3O4 + 4H2

How many molecules of H2 are produced?

How many water molecules are required?

What is the mole ratio of Fe to H2O?

How many hydrogen molecules (H2) are involved in this reaction?

Answer 1

1. If 3 molecules of iron react, then 4 molecules of H2 should be produced (coefficients).

2. If 3 molecules of iron react, then 4 molecules of water are needed (coefficients).

3. The mole ratio of iron to water is 3:4 (coefficients).

4. If 3 molecules of iron react, then 4 molecules of H2 are produced, and therefore are involved in the reaction (coefficients).