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What are the products formed when ethanol undergoes complete combustion?
CO + H2O
CO2 + H2
CO2 + H2O
C + H2O
CO2 + H2O
When ethanol undergoes complete combustion in the presence of a sufficient supply of oxygen, it oxidizes entirely to form carbon dioxide and water vapour. This reaction is highly exothermic, releasing energy in the form of heat and light.
When ethanol undergoes complete combustion in the presence of a sufficient supply of oxygen, it oxidizes entirely to form carbon dioxide and water vapour. This reaction is highly exothermic, releasing energy in the form of heat and light.
Think of a properly adjusted kitchen gas burner or laboratory Bunsen burner with a clear blue flame, which indicates that the fuel is burning completely with enough oxygen.
C2тАЛH5тАЛOH+3O2тАЛтЖТ2CO2тАЛ+3H2тАЛO тАФ Balanced equation for the complete combustion of ethanol
The chemical bonds of ethanol (C2тАЛH5тАЛOH) and oxygen molecules (O2тАЛ) are broken during combustion. Carbon atoms are fully oxidized to carbon dioxide (CO2тАЛ), and hydrogen atoms are fully oxidized to water (H2тАЛO). Incomplete combustion occurs when oxygen is restricted, leading to carbon monoxide or soot instead.
Complete combustion requires an abundant supply of oxygen.
The products of complete combustion for any hydrocarbon or alcohol are always carbon dioxide and water.
Ethanol burns cleanly compared to heavier hydrocarbons due to its pre-existing oxygen atom.
Maximizes energy release from the fuel.
Produces clean flames without soot or toxic carbon monoxide.
Releases carbon dioxide (CO2тАЛ), a greenhouse gas contributing to global warming.
Used as a biofuel and fuel additive in internal combustion engines.
Utilized in spirit lamps and portable camping stoves.
Incomplete combustion produces toxic carbon monoxide (CO) or unburnt carbon particles (soot, C).
Option C is correct because complete oxidation of ethanol yields CO2тАЛ and H2тАЛO.
C is correct тАФ Complete combustion of ethanol produces carbon dioxide and water.
Always verify oxygen availability in exam questions: excess oxygen yields carbon dioxide and water, while limited oxygen yields carbon monoxide or pure carbon.
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