Question

In the estimation of nitrogen by dumas method 4.3g of organic compound gave 250ml of nitrogen collected 300k at 1atmosphere. calculate the percentage composition of nitrogen in the compound(aqueous) tension at 300k =15mn.​

Answer 1

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Question

In Dumas' method for estimation of nitrogen, 0.3g of an organic compound gave 50mL of nitrogen collected at 300 K temperature and 715 mm pressure. Calculate the percentage composition of nitrogen in the compound. (Aqueous tension at 300 K=15 mm)

A

17.5%

B

28%

C

6.25%

D

31%

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Solution



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6.25%

Here,

Mass of organic substance =0.3 g

Volume of Nitrogen collected =50 mL

Temperature (T1)=300 K

Vapour pressure of water =15 mm

Actual pressure of dry nitrogen =715−15=700 mm

At STP, we know that P2=760 mm and T2=273 K then V2=?

⟹T1P1V1=T2P2V2

⟹300700×50=273760×V2

⟹V2=41.9 mL

Hence,