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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

Hanzala kabir , 5 Years ago
Grade 12
anser 2 Answers
Arun

% 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

Last Activity: 5 Years ago
Vikas TU
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
Last Activity: 5 Years ago
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