Final answer:
To experimentally demonstrate that propene's molecular formula is C3H6, we can conduct a combustion reaction and use stoichiometry to determine the amounts of CO2 and H2O produced, which correlate to the number of carbon and hydrogen atoms in the propene molecule.
Step-by-step explanation:
To experimentally show that the molecular formula of propene is C3H6 and not CH2, one could analyze the combustion reaction of propene. By burning a known mass of propene and measuring the amount of carbon dioxide (CO2) and water (H2O) produced, we can apply the principles of stoichiometry to deduce the number of carbon and hydrogen atoms in a propene molecule.
Since the amount of CO2 and H2O produced will be directly related to the number of carbon and hydrogen atoms in the original compound, thorough analysis of a combustion reaction will reveal that propene's molecular formula is C3H6, which has three carbon atoms and six hydrogen atoms, and not just CH2.