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 :

  • Option 1)

    16.76

  • Option 2)

    15.76

  • Option 3)

    17.36

  • Option 4)

    18.20

 

Answers (1)

As we discussed in

Dumas method- Quantitative analyse of nitrogen -

Volume\:of\:nitrogen\:at\:STP=\frac{P_{1}V_{1}\times 2t3}{760\times T_{1}}

 


percentage\:of\:Nitrogen=\frac{28\times vol\:of\:N_{2}\:at\:STP\times 100}{22400\times m}

- wherein

 

 V_{2}\:at\:STP= \frac{P_{1}V_{1}\times 273}{T_{1}\times 760}\:ml

\%\:of\:N= \frac{28\times V_{2}\times 100}{22400\times m}

m = mass of organic compound

\%\:of\:N= \frac{58\times P_{1}v_{1}\times 2+3\times 100}{22400\times T_{1}\times 760\times m}

P1 = 725 - 25  = 700 mm

v1 = 40 ml

m = 0.25 g

T1 = 300

\%\:of\:N= \frac{28\times 700\times 273\times 100}{22400\times 300\times 760\times 0.25} = 16.76


Option 1)

16.76

This option is correct

Option 2)

15.76

This option is incorrect

Option 3)

17.36

This option is incorrect

Option 4)

18.20

This option is incorrect

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