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Grade 12AIPMT

0.2g of an organic compund containing C,H and O ,gave on combustion 0.04g of water and 0.195g of CO2. The percentage of oxygen is
a)26.60. b)30.59
c)71.8. d)None of these

Question image for 0.2g of an organic compund containing C,H and O ,
Profile image of Hanzala kabir
6 Years agoGrade 12
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2 Answers

Profile image of Arun
6 Years ago

% C = [12/44][mass of carbon dioxide/mass of oragic compound] * 100= 62.07%

% of H =[2/18][mass of water/mass of organic compound]*100 = 10.34

% of O = 100 - (10.34 +62.07) = 27.59

Profile image of Vikas TU
6 Years ago
Next you need to follow the following steps
Calculate moles of each element as uou know about mass from the above mass percent values
No. of moles of
C =5.1725. H = 10.34. O = 1.72
Divide with number of moles by least number value i.e., 1.72 you get simple whole number ratio
C = 3. H = 6. O = 1
Empirical formula is C3H6O

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