On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of and 0.4428 g of was produced. The % composition of oxygen in the compound is .

Question

On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of  and 0.4428 g of  was produced. The % composition of oxygen in the compound is .

Canvas Classes · Accepted Answer

Step 1: Calculate Percentage of Carbon

From  produced:

Step 2: Calculate Percentage of Hydrogen

From  produced:

Step 3: Calculate Percentage of Oxygen by Difference

Since the compound contains only C, H, and O:

Step 4: Verification

Mass of O in compound:

Check:  g ✓

Answer: 46 (nearest integer)

Key Points to Remember:
-  is always calculated by DIFFERENCE: 
- O cannot be directly measured by combustion analysis (unlike C and H)
- 
-

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