In Dumas' method, of an organic compound yields of nitrogen gas collected at standard temperature an — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

In Dumas' method, the mass of nitrogen is derived from its volume at STP. 22400 mL of $N_2$ weighs 28 g. Therefore, 22.4 mL of $N_2$ weighs $\frac{28}{22400} \times 22.4 = 0.028\ \text{g}$. The percentage of Nitrogen = $\frac{0.028}{0.14} \times 100 = 20\%$.