0.2 g of an organic compound was subjected to estimation of nitrogen by Duma’s method in which volume of N2 evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is _____. [nearest integer]
(Given : Molar mass of N2 is 28 g mol–1, Molar volume of N2 at STP : 22.4L)
(Given : Molar mass of N2 is 28 g mol–1, Molar volume of N2 at STP : 22.4L)
Correct Answer: 14
Solution and Explanation
The correct answer is 14
Mass of organic compound = 0.2 g
Volume of \(N_2\) gas evolved at STP = 22.4 mL
Mass of \(N_2\) gas evolved
\(= \frac{22.4 × 10^{−3} × 28}{22.4} \)
= 0.028 g
Percentage of nitrogen in the compound :
\(=\frac{0.028×100}{0.2}\)
=14%
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Concepts Used:
Nitrogen
- Nitrogen is the 7th element of the periodic table between carbon and oxygen.
- It’s a crucial part of amino acids.
- Around 80% of the Earth’s atmosphere comprises nitrogen gas.
- It is odorless and colorless in nature, mostly diatomic non-metal gas.
- Since it has 5 electrons in its outermost shell, most of its compounds are trivalent.
- It is a combination of all living tissues. Since it is a component of DNA and part of a genetic code, it is a necessary element of life.
- It is found in nitrates and further nitrites in soil and water.
- The nitrogen cycle comprises all these substances and is interconnected. Industrial companies emit nitrogen enormously, increasing nitrite and nitrate content in the ground and water, being the repercussion of reactions in the nitrogen cycle.