Find Molecular Formula of Hydrocarbon from combustion?
So I am given 100CM3 of a hydrocarbon CxHy which is burned in excess oxygen, producing 400CM3 of CO2 and 500CM3 of steam(H2O).
They ask me of the molecular formula, how do I begin to solve this?

Question

Find Molecular Formula of Hydrocarbon from combustion?
So I am given 100CM3 of a hydrocarbon CxHy which is burned in excess oxygen, producing 400CM3 of CO2 and 500CM3 of steam(H2O). 
They ask me of the molecular formula, how do I begin to solve this?

anonymous · Answer

it also says that the volumes are measured under same conditions

anonymous · Answer

@thomaster please help?

anonymous · Answer

find the moles by using stoichiometry. of course, did u write down the equation. then it will look much clear.

anonymous · Answer

CxHy + O2 -> CO2 + H2O