1.

120 of an organic compound that contains only carbon and hydrogen gives 330g of CO2 and 270g of water on complete combustion. The percentage of carbon and hydrogen, respectively are. (A) 25 and 75 (B) 40 and 60 (C) 60 and 40 (D) 75 and 25

Answer»

Correct option is (D) 75 and 25

Given mass of organic compound = 120

mass of CO2(g) = 330 g 

mass of H2O (l) = 270 g

mass of carbon =\(n_{CO_2}\)x 12

 = 330/44 x 12 = 90 g

% of carbon = 90/120 x 100 = 75%

mass of hydrogen = \(n_{H_2O}\) x 2

 = 270/18 x 2 = 30g

% of hydrogen = 30/120 x 100 = 25%



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