On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g and 0.307 g . The percentages of hydrogen and oxygen in the given organic compound respectively are:

Question

On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g  and 0.307 g . The percentages of hydrogen and oxygen in the given organic compound respectively are:

Canvas Classes · Accepted Answer

Step 1: Calculate mass of Carbon

All C in compound →

Mass of C  g

Step 2: Calculate mass of Hydrogen

All H in compound →

Mass of H  g

Step 3: Calculate % H

Step 4: Calculate mass of Oxygen

Mass of O  g

Step 5: Calculate % O

Answer: % H = 6.72, % O = 53.41 → Option (b)

Key Points to Remember:
- All C in organic compound → ; mass of C 
- All H in organic compound → ; mass of H 
- Mass of O = total mass − mass of C − mass of H

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