Question follows after the explosion :Mole concept 3...

Chemistry Level 3

\(5\text{ mL}\) of a gas containing only carbon and hydrogen was mixed with \(30\text{ mL}\) of oxygen and the mixture was exploded by means of an electric spark.

After the explosion, the volume of the mixed gases remaining was \(25\text{ mL}.\)

On adding solution of concentrated \(\text{KOH},\) the volume shrunk to \(15\text{ mL},\) the residual gas being pure oxygen. All the gases have been reduced to NTP. The molecular formula of the gas with carbon and hydrogen only can be expressed as \[\text{C}_n \text{H}_m.\] Find the sum \(\displaystyle{n+m}.\)


Note

  • \(n\) and \(m\) are positive integers.
  • This is a classical 1979 IIT JEE problem.
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