When a hydrocarbon fuel is burnt, it always gives out carbon dioxide and water vapour. Do you agree? Give reasons.

When a hydrocarbon is burnt in sufficient amount of oxygen , the products formed will be carbon dioxide, water vapour and heat energy. For example : When methane (CH4) is burnt in sufficient amount of oxygen, it will give CO2 and H2O. Hydrocarbon will burn with a clean flame.
CH4 + 2O2 → CO2 + 2H2O + energy
C2H6 + 7/2O2 → 2CO2 + 3H2O + energy
But when hydrocarbon is burnt in insufficient amount of oxygen , then the products formed are solid carbon  , water and energy. Burning of hydrocarbon in insufficient oxygen will give sooty flame.
CH4 + O2 → C + 2H2O

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