Question

A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

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Solution

Ethyne:Ethyne is a chemical compound with a molecular formula $\left({\mathrm{C}}_{2}{\mathrm{H}}_{2}\right)$.It is a colorless gas that is used as fuel.Reaction of ethyne with Oxygen:When ethyne reacts with a mixture of oxygen it produces carbon dioxide along with water.The chemical reaction can be depicted as: $2\mathrm{HC}\equiv \mathrm{CH}\left(\mathrm{g}\right)+5{\mathrm{O}}_{2}\left(\mathrm{g}\right)\to 4{\mathrm{CO}}_{2}\left(\mathrm{g}\right)+2{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{g}\right)\phantom{\rule{0ex}{0ex}}\left(\mathrm{Ethyene}\right)\left(\mathrm{Oxygen}\right)\left(\mathrm{Carbon}\mathrm{dioxide}\right)\left(\mathrm{Water}\right)$A mixture of ethyne and oxygen is used for welding as they both combine completely producing a clean flame.When ethyne is burnt with oxygen a high temperature is attained due to the complete combustion of ethyne. Thus, it is used in welding.A mixture of ethyne and air is not used for welding as no high temperature is being attained when ethyne is burnt with air and it produces a sooty flame.

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