JEE PYQ: Qualitative Analysis Question 2
Question 2 - 2021 (16 Mar Shift 2)
In Duma’s method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg pressure. The percentage composition of nitrogen in the compound is ____ (Round off to the Nearest Integer).
[Given: Aqueous tension at 287 K = 14 mm of Hg]
Show Answer
Answer: 19
Solution
Actual pressure = 758 - 14 = 744 mm Hg. Volume at STP = (273 × 744 × 30)/(287 × 760) = 27.935 mL. Mass of N₂ = (28/22400) × 27.94 = 0.0349 g. % N = (0.0349/0.1840) × 100 = 18.97% ≈ 19%.
BETA
