####57. of a gas containing only carbon and hydrogen were mixed with an excess of oxygen and the mixture exploded by means of electric spark. After explosion, the volume of the mixed gases remaining was .
On adding a concentrated solution of , the volume further diminished to , the residual gas being pure oxygen. All volumes have been reduced to NTP. Calculate the molecular formula of the hydrocarbon gas.
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Solution:
- In the present case, ( all the volumes are measured under identical conditions of temperature and pressure) Hence, the reaction stoichiometry can be solved using volumes as :
volume of (remaining unreacted)
Volume of produced
remaining
produces of
will produce of
Also, combines with of
will combine with
of out of
, hence hydrocarbon is
(remaining unreacted)
