Finding molecular formula from volume of products

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SUMMARY

The discussion focuses on determining the molecular formula of a hydrocarbon based on the reaction volumes provided. The user calculates that 18 cm³ of CO₂ and 4.5 cm³ of H₂O are produced from the reaction of 6.0 cm³ of hydrocarbon with 34.5 cm³ of oxygen, resulting in 22.5 cm³ of gaseous products. The user seeks guidance on calculating the volume of oxygen that reacted and whether to convert volumes into moles for further analysis. The correct approach involves using stoichiometry to relate the volumes of reactants and products.

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  • Knowledge of the ideal gas law
  • Familiarity with the concept of molar volume at room temperature
  • Basic skills in chemical equations and balancing reactions
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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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