Question

Estimation of nitrogen present in the organic compound by dumas method 0.35g yielded 20.7ml of nitrogen at 150c and760mm. Calculate the percentage of nitrogen in the compound

Answer 1

Answer:

mass of organic compound --- 0.246 g

mass of CO2 formed ----- 0.198 g

percentage of Carbon = 12 x mass of CO2 formed x 100

44 mass of organic compound

percentage of carbon = 12 /44 x 0.198/0.246 x 100

percentage of carbon = 2.376/10.824 x 100

% carbon = 0.2195 x 100

%carbon = 21.95

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21.95% of carbon is present in the compound

Percentage of hydrogen =2/18× mass of H2O/mass of compound×100 = 2×0.1014×100/18×0.246 = 4.58

Hence,the composition of compounds are

CARBON : 21.95%

HYDROGEN : 4.58%.

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