While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25g of the compound neutralized 2.5mL of 2M H2SO4. The percentage of nitrogen present in organic compound is ________
Correct Answer: 56
Solution and Explanation
NH3 gas is neutralized by 2⋅5mL of 2M H2SO4
∴ Moles of NH3 neutralized = \(2⋅5 × 2 × 2\) millimole
= \(10×10^{–3}\) moles
∴ Weight of N present in compound will be
= \(10 × 10^{–3}\times14\)
= 0⋅14g
% of ‘N’ in compound
=\(\frac{0.14}{0.25}\)×100=56%
Top Questions on Nitrogen
Given below are two statements I and II.
Statement I: Dumas method is used for estimation of "Nitrogen" in an organic compound.
Statement II: Dumas method involves the formation of ammonium sulfate by heating the organic compound with concentrated H\(_2\)SO\(_4\). In the light of the above statements, choose the correct answer from the options given below:- Nitrogen is an essential component of:
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(Given : Molar mass of N2 is 28 g mol–1, Molar volume of N2 at STP : 22.4L)
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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.