In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is _____ %.

(Aqueous tension at 300 K is 15 mm.) [2026]

Question

In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is _____ %.

(Aqueous tension at 300 K is 15 mm.) [2026]

Smart Achievers · Accepted Answer

(15)

$P_{N_{2}} = (715 - 15) mm = \frac{700}{760} atm$

$V_{N_{2}} = 70 ml = \frac{70}{1000} L$

$n_{N_{2}} = \frac{P V}{R T} = \frac{(\frac{700}{760}) (\frac{70}{1000})}{0.0821 \times 300}$

$W_{N_{2}} = \frac{700}{760} \times \frac{70}{1000} \times \frac{1}{0.0821 \times 300} \times 28$

$% N = \frac{W_{N_{2}}}{0.5} \times 100 = \frac{700}{760} \times \frac{70}{1000} \times \frac{1}{0.0821 \times 300} \times \frac{28}{0.5} \times 100$

$= 14.65 % \approx 15$

Solution

Q.
In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is _____ %.

(Aqueous tension at 300 K is 15 mm.) [2026]

Want Us to Email you About Special Offers & Updates?

Solution

Q. In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is _____ %. (Aqueous tension at 300 K is 15 mm.) [2026]

Ans. (15) PN2=(715-15) mm=700760 atm VN2=70 ml=701000 L nN2=PVRT=(700760)(701000)0.0821×300 WN2=700760×701000×10.0821×300×28 % N=WN20.5×100=700760×701000×10.0821×300×280.5×100 =14.65%≈15

Want Us to Email you About Special Offers & Updates?

Q.
In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is _____ %.

(Aqueous tension at 300 K is 15 mm.) [2026]