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Question

Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :

A
50.33
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B
53.33
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C
51.63
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D
63.53
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Solution

The correct option is B 53.33
General reaction:
CxHyOz+(x+y4z2)O2xCO2+y2H2O
From the above equation the relation for number of moles is:
nC=nCO2=2.6444=0.06 mol

nH=2×nH2O=1.0818×2=0.12 mol

Mass of carbon, mC=2.6444×12=0.72 g
Mass of hydrogen, mH=1.0818×2=0.12 g
Mass of oxygen,
mO=Mass of hydrocarbonmCmH
=1.800.720.12=0.96 g
% O=0.961.80×100=53.33%

Hence the correct answer is option (b).

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