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Homework Help: {Thermochemistry} Hess' law problem

  1. Feb 7, 2010 #1
    1. The problem statement, all variables and given/known data
    Benzene (C6H6) is a liquid which burns in air to form liquid water and carbon dioxide. Calculate the heat released by burning one gram of benzene.

    [tex]\Delta[/tex]Hof, kJ/mol
    carbon dioxide (g) = -393.5
    water (l) = -285.8
    benzene (l) = 49.04

    2. Relevant equations
    2C6H6 (l) + O2 (g) >> 12 CO2 (g) + 6 H2O (l)

    3. The attempt at a solution

    I got -25.42 kJ ... do I have to find the amount of moles in 1 gram of benzene first? and then do the calculations?
  2. jcsd
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