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Standard IX
Chemistry
Empirical Formula
A gaseous com...
Question

A gaseous compound having carbon, hydrogen and oxygen was burnt in the presence of oxygen. After combustion, 1 volume of the gaseous compound produces 2 volumes of CO2 and 2 volumes of steam. Determines the molecular formula of the compound, if all the volumes were measured under the same conditions of pressure and temperature.

A
C2H4O2
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B
C3H6O3
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C
C4H8O2
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D
C5H10O3
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Solution

The correct option is C C2H4O2
Suppose the chemical formula of the compound be CxHyOz chemical reaction related to the combustion of the compound.
CxHyOz+mO2→xCOz+y2H2O (Steam)
1 vol. 2 vol. 2 vol. 2 vol. Given
1. mol 2 mol 2 mol 2 mol. (By Avogadro hypothesis)

Since 2 molecules of CO2 have 2 atoms of carbon and this carbon must have come from the compound. Hence, the value of x is 2.

Again, 2 molecules of steam contain 4 atoms of hydrogen and they have come from the compound. Hence, the value of y will be 4.

So, the molecular formula of the compound is C2H4O2.

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