Class 11 Chemistry - Chapter Organic Chemistry Some Basic Principles and Techniques NCERT Solutions | An organic compound contains 69% carbon
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.
Percentage of carbon in organic compound = 69 %
That is, 100 g of organic compound contains 69 g of carbon
. ∴0.2 g of organic compound will contain 69x.02 / 100 = 0.138g of C
Molecular mass of carbon dioxide, CO2 = 44 g
That is, 12 g of carbon is contained in 44 g of CO2.
Therefore, 0.138 g of carbon will be contained in 44x0.138/12 = 0.506 g of CO2
Thus, 0.506 g of CO2 will be produced on complete combustion of 0.2 g of organic compound.
Percentage of hydrogen in organic compound is 4.8.
i.e., 100 g of organic compound contains 4.8 g of hydrogen.
Therefore, 0.2 g of organic compound will contain 4.8x0.2/100 = 0.0096 g of H
It is known that molecular mass of water (H2O) is 18 g.
Thus, 2 g of hydrogen is contained in 18 g of water.
∴0.0096 g of hydrogen will be contained in 18x0.0096/2 = 0.0864g of water
Thus, 0.0864 g of water will be produced on complete combustion of 0.2 g of the organic compound.
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