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Finding molecular formula from volume of products

  1. Jun 7, 2008 #1
    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.
  2. jcsd
  3. Jun 7, 2008 #2
    Sry I have posted this thread in the wrong section.

    Thread should be closed, sorry moderator.
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