Mole ConceptMedium
Question
In Dumas method, 0.2 g of an organic nitrogenous compound gave 28 ml of N2 (volume reduced to 0o C and 1 atm). What is the percentage of nitrogen by mass in the compound?
Options
A.17.5
B.8.75
C.35.0
D.14.0
Solution
Mass of nitrogen in the compound =$\frac{28}{22400} \times 28 = 0.035g$
Percentage of nitrogen in the compound =$\frac{0.035}{0.2} \times 100 = 17.5\%$
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