Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry

Question

The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6: 1. If one molecule of the above compound (CXHYOZ) contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of compound CXHYOZ is

  • C2H4O3

  • C3H6O3

  • C2H4O

  • C3H4O2

Answer

A.

C2H4O3

The ratio of mass % of C and H in CxHyOz is 6: 1.
Therefore,
The ratio of mole % of C and H in CxHyOz will be 1: 2.
Therefore x : y = 1 : 2, which is possible in options 1, 2 and 3.
Now oxygen required to burn CxHy

CxHy + x + y4O2      xCO2 + y2H2O

Now z is half of the oxygen atoms required to burn CxHy

 z = (2x +y2)2 = x + y4

Now putting values of x and y from the given options:
Option (1), x = 2, y = 4

z = 2 + 44 = 3Option 2, x = 3, y = 6z = 3 + 64 = 4.5Therefore correnct (C2H4O3)

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