In order to develop a new skill, Valir sparked 20 cm3 of a gaseous hydrocarbon with 150 cm3 of oxygen and the residual gases cooled to room temperature, a contraction of 60 cm3 occurred. A further contraction of 80cm3 took place when the residual gases were subjected to aqueous NaOH. Find formula of the hydrocarbon Valir combusts. [All gaseous volumes are measured under identical conditions.]













