Question

At 715 mm Hg pressure, 300 K, volume of N₂ (g) evolved was 80 mL by a 0.4 g sample of organic compound. Find % of N in organic compound

Aq. tension at 300 K = 15 mm Hg

(1) 20.95

(2) 25.85

(3) 30.25

(4) 15.83

Answer 1

Correct option is : (1) 20.95

\(\text{V}_{N_2} \ \text{at STP} = \frac{273 \times (715-15)\times 80}{300 \times 760 }\)

= 67.05 mL

22400 mL weighs 28 g

\(67.05 \ \text{mL}\ \text{weighs} \frac{28}{22400} \times 67.05\)