Question

3

Which chemical equation below is balanced to correctly represent the Law of
Conservation of Mass?
04 Al + 3O2 + 2 Al2O3
O2 AL + O2 + 2 Al2O3
O AL + O2 + Al2O3

Answer 1

4Al + 3O₂ → 2Al₂O₃

Step-by-step explanation:

4Al + 3O₂ → 2Al₂O₃

Only this reaction above obeys the law of conservation of mass. The others flout the rule.

The law of conservation of mass states that "matter is neither created nor destroyed in a chemical reaction but are simply transformed from one form to another".

By this law, the number of atoms on both sides of expression must be the same;

Number of atoms

Elements Left hand side Right hand side

Al 4 4

O 6 6