Acetylene (C2 H2) is burned with the stoichiometric amount...

Acetylene $\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)$ is burned with the stoichiometric amount of air during a combustion process. Assuming complete combustion, determine the air-fuel ratio on a mass and on a mole basis.

Key Concepts

Combustion Reactions

Combustion reactions involve a fuel reacting with an oxidizer, typically oxygen, to produce energy in the form of heat and light. In the context of hydrocarbons, complete combustion occurs when the fuel reacts fully with oxygen, forming carbon dioxide and water, without any leftover fuel or oxygen.

Stoichiometric Combustion

Stoichiometric combustion refers to the precise ratio of fuel to air where all the fuel is completely burned using exactly the amount of oxygen required by the chemical reaction. This concept is essential for determining the air-fuel ratio since it is based on ensuring that the number of oxygen molecules equals the number needed to convert all the carbon and hydrogen in the fuel to CO2 and H2O.

Chemical Stoichiometry

Chemical stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. It is used to balance chemical equations and calculate the amounts of substances consumed and produced, which is crucial when determining the amount of air (specifically oxygen) required to combust a given amount of fuel.

Air-Fuel Ratio

The air-fuel ratio is a key parameter in combustion processes that represents the proportion of air mass or moles to fuel used in the reaction. This ratio can be expressed on either a mass basis or a mole basis, and it influences the combustion efficiency, performance, and emissions of the combustion system.

Air Composition

Understanding air composition is vital because air is not pure oxygen; it is a mixture, primarily of oxygen and nitrogen, with oxygen making up about 21% of air by volume. When performing stoichiometric calculations, the presence of nitrogen, which does not participate in the combustion reaction, must be accounted for, as it affects both the mole and mass calculations of the air-fuel ratio.

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