Finding molecular formula from volume of products

AI Thread Summary
The discussion revolves around a chemistry problem involving the combustion of a gaseous hydrocarbon. The initial conditions include 6.0 cm³ of hydrocarbon and 34.5 cm³ of oxygen, with the gaseous products cooling to 22.5 cm³. After passing through aqueous potassium hydroxide, the volume reduces to 4.5 cm³, indicating the amount of carbon dioxide produced. The user calculates the volume of CO2 as 18 cm³ and infers that the volume of water vapor is 4.5 cm³. The main confusion lies in determining the volume of oxygen that reacted and whether to convert volumes into moles for further calculations. The user expresses a desire to close the thread, indicating a lack of clarity on the problem-solving process.
Ose90
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Hello sir and madam, I would be grateful if you can help me solve this question.

6.0 cm^3 of a gaseous hydrocarbon was sparked with 34.5 cm^3 of oxygen. The volume of the gaseous products after cooling to room temperature was 22.5 cm^3. The volume was reduced to 4.5 cm^3 on passing the gases through aqueous potassium hydroxide. What is the molecular formula of hydrocarbon?

my doubts : First, I try calculating the volume of CO2 produced and It is 18cm^3 and the volume of H2O is apparently 4.5 cm^3. What should I do next? How to find the volume of oxygen gas that has reacted? Should I convert them into moles by dividing the volume of room temperature? I'm confused :(

Thanks in advance.
 
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Sry I have posted this thread in the wrong section.

Thread should be closed, sorry moderator.
 

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