1. Balanced Chemical Equation:

The balanced chemical equation for the reaction is:

N₂ + 3H₂ → 2NH₃

2. Mole Ratio:

From the balanced equation, we see that 1 mole of N₂ produces 2 moles of NH₃.

3. Calculate Moles of NH₃:

Since we have 1.20 mol of N₂, we can use the mole ratio to find the moles of NH₃ produced:

1.20 mol N₂ * (2 mol NH₃ / 1 mol N₂) = 2.40 mol NH₃

4. Convert Moles to Mass:

To convert moles of NH₃ to mass, we use the molar mass of NH₃ (17.03 g/mol):

2.40 mol NH₃ * (17.03 g NH₃ / 1 mol NH₃) = 40.9 g NH₃

Therefore, 40.9 g of NH₃ is produced when 1.20 mol of N₂ react completely.