Here's how to balance the equation for the reaction of hydrogen (H₂) and nitrogen (N₂) to form ammonia (NH₃):

Unbalanced Equation:

H₂ + N₂ → NH₃

Balancing Steps:

1. Nitrogen (N): There are 2 nitrogen atoms on the left side (N₂) and only 1 on the right side (NH₃). To balance this, put a coefficient of 2 in front of NH₃:

H₂ + N₂ → 2NH₃

2. Hydrogen (H): Now there are 6 hydrogen atoms on the right side (2 x 3 = 6). There are only 2 on the left side. To balance this, put a coefficient of 3 in front of H₂:

3H₂ + N₂ → 2NH₃

Balanced Equation:

3H₂ + N₂ → 2NH₃