In Dumas' method for estimation of nitrogen, 0.5 gram 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

Question

In Dumas' method for estimation of nitrogen, 0.5 gram 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 (Aqueous tension at $300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}$ ) is

Canvas Classes · Accepted Answer

Step 1: Understand Dumas' Method Principle

In Dumas' method, the organic compound is heated with copper oxide (CuO). All nitrogen in the compound is converted to  gas:

gas is collected over KOH solution (which absorbs ) in a nitrometer.

Step 2: Correct for Aqueous Tension

The  gas is collected over water, so the measured pressure includes water vapour pressure (aqueous tension).

Step 3: Calculate Volume at STP Using Gas Laws

Given:  mL,  K,  mm Hg

Converting to STP (T₀ = 273 K, P₀ = 76

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