Q. 32

An organic compound contains 69% carbon and 4.8% hydrogen, the remainder being oxygen. Calculate the masses of carbon dioxide and water produced when 0.20 g of this substance is subjected to complete combustion.

Answer :

Percentage of carbon in organic compound=69%


That is,100g of organic compound contains 69g of carbon


So, 0.2g of organic compound will contain==0.138g of C


Molecular mass of carbon dioxide, CO2=44g


i.e., 12g of C will be contained in =0.506g of CO2.


Thus,0.506g of CO2 will be produced on complete combustion of 0.2g of organic compound.


Percentage of hydrogen in organic compound is 4.8


i.e., 100 g of organic compound contains 4.8g of hydrogen.


Therefore,0.2 g of organic compound will contain=(


=0.0096g of H


It is known that molecular mass of water=18g


Thus,2 g of hydrogen will be contained in=


=0.0864g of water.


Thus,0.0096g of water will be produced on complete combustion of 0.2g of the organic compound.


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