How much hydrogen reacts with 10 m3 of nitrogen and how much ammonia is formed by volume?

Reaction equation: N2 + 3H2 = 2NH3
Since the volumes of the reacting and formed gases under the same conditions are proportional to the quantities of these substances (stoichiometric coefficients) indicated in the reaction equation, we will compose the proportion. 1. For hydrogen and nitrogen: V (H2) / 3 mol = 10 m3 / 1 mol. Hence V (H2) = 3 * 10 = 30 m3. 2. For nitrogen and ammonia: 10 m3 / 1 mol = V (NH3) / 2 mol. Hence V (NH3) = 2 * 10 = 20 m3.