JEE Main 2022 · 24 Jun · Shift 2 · Chemistry Q88

← JEE Main 2022 · 24 Jun · Shift 2

ChemistryInteger+4 / -1Question 88 of 90

0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $\mathrm{N_2}$ evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is ______. [nearest integer]

(Given: Molar mass of $\mathrm{N_2}$ is 28 g mol $^{-1}$ , Molar volume of $\mathrm{N_2}$ at STP : 22.4 L)

Your answer

Answer and worked solution

Official answer: 14

Nitrogen. 22.4 mL at STP is $10^{-3}$ mol $\mathrm{N_2}$ , i.e. 0.028 g.

Percentage. $\dfrac{0.028}{0.2}\times100=14\%$ .

Answer: 14

Topics:Qualitative and quantitative analysis of organic compounds

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JEE Main 2022 · 24 Jun · Shift 2, Chemistry question 88