0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is . [ne

Question

0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of  evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is . [nearest integer]

(Given: Molar mass of  is 28 , Molar volume of  at STP: 22.4 L)

Canvas Classes · Accepted Answer

Step 1: Understand the Given Data

Given (already at STP):
- Volume of  at STP = 22.400 mL = 0.02240 L
- Mass of compound = 0.2 g
- Molar mass of  = 28 g/mol
- Molar volume at STP = 22.4 L/mol

Step 2: Calculate Moles of N₂

Step 3: Calculate Mass of Nitrogen

Molar mass of  = 28 g/mol (contains 2 N atoms)

This is also the mass of all nitrogen atoms (N) since 28 g/mol = 2 × 14 g/mol:

Step 4: Calculate Percentage of Nitrogen

Answer: 14 (nearest integer)

Key Points to Remember:
- When vo

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