1. The problem statement, all variables and given/known data 0.1 dm^3 of a gaseous hydrocarbon may require 0.45 dm^3 of oxygen for a complete combustion to give 300 cm^3 of Carbon dioxide. All volumes are measured in the same environment. Calculate the molecular formula of the hydrocarbon. 3. The attempt at a solution i tried getting the gdc of 10, 30 and 45 =90. and the have like 9 CxHy + 2 O2 --> 3 CO2 + H2O but I cannot go further than this. please help. Thanks.