A sample of of a neutral -amino acid (A) generated exactly of gas at standard temperature and pressu — Biomolecules Chemistry Question

💡 Solution & Explanation

Aliphatic primary amines (like the $\alpha$ -amino group) react quantitatively with $HNO_2$ to release exactly 1 mole of $N_2$ gas per mole of amine. Moles of $N_2 = \frac{0.224\text{ L}}{22.4\text{ L/mol}} = 0.01\text{ mol}$. This corresponds to $0.01\text{ mol}$ of the amino acid. Molar mass = $\frac{0.89\text{ g}}{0.01\text{ mol}} = 89\text{ g/mol}$ (indicating the amino acid is Alanine).