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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

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

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Grade:12

2 Answers

Arun
25750 Points
4 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

Vikas TU
14149 Points
4 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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