Question

According to the Law of Conservation of Mass, the number of iron atoms needed to complete the following reaction is ___ Fe + 3O2 → 2Fe2O3

Answer 1

4

Step-by-step explanation:

TRUST ME

Answer 2

is 4

Step-by-step explanation:

Fe + 3O₂ → 2Fe₂O₃

The law of conservation of mass states that "matter is neither created or destroyed in a system". Now, by careful inspection of the atoms reacting and the product formed, we see that the equation is not balanced.

Fe on reactant side is 1 but 4 on the product side. To balance it up, we simply put 4 as the coefficient behind the iron atoms.

4Fe + 3O₂ → 2Fe₂O₃