Volume of air for complete combustion of alkane

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SUMMARY

The discussion centers on calculating the volume of oxygen required for the complete combustion of an alkane. The volume of oxygen is derived from the balanced chemical equation, where the coefficient '25' represents the stoichiometric ratio of oxygen to alkane. The '24 dm³' refers to the molar volume of a gas at standard conditions. Understanding the balanced equation is crucial for determining the quantities of reactants and products in combustion reactions.

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desmond iking
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Homework Statement



according to the model ans, the volime of oxygen produced is 25x 24 dm^3 ...



where does the 25 come from ??



or someone can show me other step of getting the ans ? thanks in advance!

according to the model ans, the volime of oxygen produced is 25x 24 dm^3 ...

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Isn't that just the 25 from the chemical reaction above?
The 24dm3 is probably the molar volume.
 
The 25 comes from the balanced equation on that 3rd line. Until you have the reaction equation balanced, you can't determine the quantities of each of the reagents involved.

Oxygen is not produced. Oxygen is consumed in the reaction.
 

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