To determine the mass of hydrogen needed to react with 50.0g of nitrogen, the balanced chemical equation N2 + 3H2 → 2NH3 is used. The calculation shows that 16.1g of hydrogen is required, derived from the molar masses of nitrogen and hydrogen. There is a discussion about the diatomic nature of nitrogen, confirming that its molar mass is 28g/mol, not 14g/mol. A mistake in the reaction equation was noted, as hydrogen should be represented as H2 instead of H3. The volume of one mole of any gas at standard temperature and pressure is correctly stated as 22.4L, regardless of the gas type.