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Homework Help: Empirical formula prob.

  1. Oct 8, 2009 #1
    1. The problem statement, all variables and given/known data

    A whole class of compounds is composed of just carbon and hydrogen, the "hydrocarbons". If a 7.81 g sample of a hydrocarbon was analyzed and the carbon was converted to 26.4g of CO2 what is the empirical formula?

    2. Relevant equations

    No clue what converted means... and how a part of the sample increases in mass...

    3. The attempt at a solution


    a) CH b)CH10 c)C2H10 d)C10H e)C10H2
  2. jcsd
  3. Oct 8, 2009 #2


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    Staff: Mentor

    I see your confusion.

    7.81 g of hydrocarbon was burnt in exess oxygen, 26.4 g of CO2 were produced.

  4. Oct 8, 2009 #3


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    Homework Helper
    Education Advisor
    Gold Member

    "Converted" means the hydrocarbon reacted with oxygen at a high temperature, and the carbon was all burned to carbon dioxide.
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