Question

In the Dumas method for the estimation of nitrogen, 0.84 g of an organic compound Gave 448 mL of nitrogen at STP. The percentage of nitrogen in the compound is:

• A. 33.3 %
• B. 66.7 %
• C. 50 %
• D. 60 %

Answer 1

The correct option is B 66.7 %

% of $N=\frac{28\times V\times 100}{22400\times W}=\frac{28\times 448\times 100}{22400\times 0.84}=66.7\%$