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Some Basic Concepts of Organic Chemistry question

2015 · Q107
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Some Basic Concepts of Organic Chemistry question

2015 · Q107

NEETChemistrySome Basic Concepts of Organic ChemistryMCQ+4 / −1
In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
  1. A
    16.75
  2. B
    15.76
  3. C
    17.36
  4. D
    18.20
View written solutionFree

Correct answer: A

Wt. of organic substance = 0.25 g

V1 = 40 mL, T1 = 300 K

P1 = 725 – 25 = 700 mm of Hg

P2 = 760 mm of Hg (at STP)

T2 = 273 K

P1V1T1=P2V2T2{{{P_1}{V_1}} \over {{T_1}}} = {{{P_2}{V_2}} \over {{T_2}}}T1​P1​V1​​=T2​P2​V2​​

V2 = 700×40×273300×760{{700 \times 40 \times 273} \over {300 \times 760}}300×760700×40×273​ = 33.52 mL

Percentage of nitrogen

= 28×33.52×10022400×0.25{{28 \times 33.52 \times 100} \over {22400 \times 0.25}}22400×0.2528×33.52×100​

= 16.76%

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