20cm3 of a gaseous hydrocarbon was mixed with 150cm3 of oxygen. The mixture was sparked so that the hydrocarbons was completely burned. The gaseous products had a total volume of 130cm3. When this product was passed over to soda lime, the volume of the product decreased to 90cm3. All gases were measured at s.t.p. Deduce the molecular formula of the hydrocarbon.
Molecular Formula="C_4H_{10}"
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