Can someone please help me with this problem. I have an exam tomorrow :(

The combustion of 135.0 mg of a hydrocarbon produces 440mg of CO2 and 135mg of H2O. The molar mass of the hydrocarbon is 270 g/mol. Determine the empirical formula?

Some discussion and solved examples:

http://www.chemteam.info/Mole/Combustion…