In Dumas' method for estimation of nitrogen, 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the co

Question

In Dumas' method for estimation of nitrogen, 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is:

(Given: Aqueous tension at 300 K = 15 mm Hg)

Canvas Classes · Accepted Answer

Strategy:
 estimation of Nitrogen by Dumas method uses the Ideal Gas Law. Always subtract the aqueous tension from the total pressure to determine the pressure exerted by the dry Nitrogen gas.

Step 1: Calculate pressure of dry Nitrogen

Step 2: Calculate moles of Nitrogen
Using  (, ):

Step 3: Calculate percentage composition
Mass of .

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