In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75 g of sample neutralized 1 0 m l of 1 M   H 2 S O 4 The percentage of nitrogen in the soil is:

Step-by-step solution

moles of 1 M   H 2 S O 4 = 10   m   m o l moles of N H 3 consumed =   20   m   m o l Weight of N = 14 × 20 1000 g = 0.280   g %  N = 0 .280 0 .75 × 100 = 37 .33 %