Flue gas generated by the thorough combustion of pure acetylene (a hydrocarbon fuel) will comprise __________________?
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Answer: D. Both B. & C.
Explanation
Complete combustion of pure acetylene hydrocarbon molecules produces carbon dioxide and water. Carbon in acetylene oxidizes fully to form carbon dioxide gas in the flue. Hydrogen in acetylene oxidizes to produce water vapor as a second combustion product. Acetylene has the chemical formula C2H2 with a high carbon-to-hydrogen ratio. Thorough combustion requires stoichiometric oxygen to prevent soot or carbon monoxide formation. Both reaction products mix into the hot exhaust gas stream continuously.
Oxy-acetylene welding torches utilize these high-temperature combustion reactions effectively. Understanding flue gas composition helps engineers calculate flame temperatures and heat transfer. Water vapor condenses at lower temperatures, while carbon dioxide is discharged safely. Carbon monoxide indicates incomplete combustion and is absent during thorough burning. Listing only carbon dioxide ignores the necessary formation of water vapor from hydrogen. Listing only water vapor ignores the essential formation of carbon dioxide from carbon.
- Subject
- Engineering
- Category
- Chemical Engineering
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- —
- Difficulty
- medium
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