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25 mL of a gaseous hydrocarbon is mixed ...

25 mL of a gaseous hydrocarbon is mixed with 150mL of oxygen in an eudiometer. After sparking and cooling back the mixture is passed through alkaline pyrogallol. The volume loss surffered in pyrogallol is 25mL. Calculate the molecular weight of hydrocarbon.

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Volume of oxygen taken = 150mL
Volume of unreacted oxygen, absorbed in pyrogallol = 25mL
Ratio of volumes of hydrocarbon and oxygen = 25mL : 125mL = 1:5
One volume of hydrocarbon consumes five volumes of oxygen for combustion.
The gaseous hydrocarbon is `C_(3)H_(8)`
Molecular weight of the gaseous hydrocarbon = 44
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