Dumas Method – Nitrogen % in 60 Sec!
❓ Question Dumas Method – Nitrogen % in 60 Sec! A quick, exam-oriented breakdown of how Dumas Method helps you find percentage of nitrogen in an organic compound using only the nitrogen gas collected . 📝 1️⃣ Dumas Method Concept Organic compound is heated strongly → Nitrogen present in compound converts into N₂ gas → This N₂ is collected over water and its volume, temperature, pressure are measured. ✔ No chemical titration ✔ 100% physical calculation ✔ Based on ideal gas equation 📝 2️⃣ Correcting the Pressure (MOST Important Step) Gas is collected over water , so total pressure = Pressure of dry N₂ + water vapour pressure. Corrected pressure: P N 2 = P total − P aq. tension Given: P total = 715 mmHg , P aq. tension = 15 mmHg So, P N 2 = 700 mmHg 📝 3️⃣ Ideal Gas Equation (Find moles of N₂) P V = n R T Convert units: P = 700 mmHg = 700 / 760 atm P = 700\ \text{mmHg} = 700/760\ \text{atm} V = 50 mL = 0.0...