120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO 2 and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are.

Question

120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO 2 and 270 g 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

Tardigrade Admin · Accepted Answer

Given mass of organic compound =120 mass of CO 2( g )=330 g mass of H 2 O (ℓ)=270 g mass of carbon = n CO 2 × 12 =(330/44) × 12=90 g % of carbon =(90/120) × 100=75 % mass of hydrogen = n H 2 O × 2 =(270/18) × 2=30 g % of hydrogen =(30/120) × 100=25 %

Q. 120 g 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.

25 and 75

40 and 60

60 and 40

75 and 25

Given mass of organic compound =120 mass of CO2​(g)=330g mass of H2​O(ℓ)=270g mass of carbon =nCO2​​×12 =44330​×12=90g % of carbon =12090​×100=75% mass of hydrogen =nH2​O​×2 =18270​×2=30g % of hydrogen =12030​×100=25%

Q. $120$ g of an organic compound that contains only carbon and hydrogen gives $330 g$ of $C O_{2}$ and $270 g$ of water on complete combustion. The percentage of carbon and hydrogen, respectively are.