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0.92 g of an organic compound containing...

0.92 g of an organic compound containing carbon, hydrogen and oxygen was analysed by combustion method. The increase in mass of the U tube and the potash bulbs at the end of the experiment was found to be 1.08g and 1.76g respectively. Determine the percentage composition of carbon, hydrogen and oxygen in the compound.

Text Solution

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Increase in mass of .U. tube =1.08 g
i.e, mass of water formed =1.08 g
Since, 18g of `H_(2)O` contain =2g of hydrogen
Percentage of hydrogen `=(2)/(18) xx (1.08)/(0.92) xx 100`
Increase in mass of potash bulbs =1.76g
Mass of carbon-dioxide formed =1.76g
Since, 44g of `CO_(2)="12g of carbon"`
1.76 of `CO_(2)=(12)/(44) xx 1.76"g of carbon"`
Percentage of carbon `=(12)/(44) xx (1.76)/(0.92) xx 100=52.17`
Percentage of oxygen =100-(% C +% H)
=100-(52.17+13.04) =34.79
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