Which of the following equations are balanced?

CO + 3H2 - -> CH3OH

PCl3 + 2Cl2 - -> PCl5

2KClO3 - -> 2KCl + 3O2

Mg + N2 - -> Mg3N2

The only balanced equation is:

2KClO₃ → 2KCl + 3O₂

Explanation:

In reactant side: 6 atoms of O, 2 atoms of Cl and 2 atoms of K

In product side: 2 atoms of K and 2 atoms of Cl + 6 atoms of O

CO + 3H₂ → CH₃OH

In reactant side: 1 C, 1 O and 6 H

In product side: 1 C, 4 H and 1 O

PCl₃ + 2Cl₂ → PCl₅

In reactant side: 1 P, 7 Cl

In product side. 1 P, 5 Cl

Mg + N₂ → Mg₃N₂

In reactant side 1 Mg and 2 N

In product side 3 Mg and 2 N