"Mike Young" wrote:
Not just "very likely"; burning hydrocarbons produces primarily water
vapor
and carbon dioxide. Propane C2H6, butane C4H10, acetylene C2H2, methane
CH4,
combine with oxygen O2 (combust) to produce primarily H2O and CO2.

pedant
Propane is C3H8; the C2H6 you listed is ethane.
/pedant

Jon