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Question

0.2 g of an organic compound contains C, H, O on combustion, it yields 0.15 g of CO2 and 0.12 g H2O. The percentage of C, H and O respectively is:

A
C=15 %, H=20 %, O=65 %
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B
C=10 %, H=8.2 %, O=81.8%
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C
C=12.2 %. H=8.8 %, O=79 %
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D
C=20 %, H=6.66 %, O=73.34 %
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Solution

The correct option is B C=20 %, H=6.66 %, O=73.34 %
Weight of organic compound = 0.2g
Weight of CO2 = 0.15g
Weight of H2O = 0.12g
Molecular weight of CO2 = 44
Molecular weight of H2O = 18
Atomic weight of carbon = 12u
Atomic weight of H2 = 2u
Percentage of carbon=Atomic weight of carbonMolecular weight of CO2×Weight of CO2Weightoforganiccompound×100
Percentage of carbon=1244×0.150.2×100=20.45%20%
Percentage of Hydrogen=Atomic weight of HydrogenMolecular weight of H2O×Weight of H2OWeightoforganiccompound×100
Percentage of Hydrogen=218×0.120.2×100=6.66%
Percentage of oxygen = 100 - (Percentage of carbon + Percentage of hydrogen) = 100 - (20 + 6.66) = 100 - 26.66 = 73.34 %

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