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Homework Help: Physical Chemistry Question

  1. Feb 7, 2008 #1
    1. The problem statement, all variables and given/known data

    The chemical reaction in which C and 02 (Dioxide) form Carbon dioxide produces 4.1 eV (Electron-Volts) of energy per Carbon atom. How much electrical energy, in W-hrs, is produced by burning a pound of coal? Here are all the conversions:

    1kg.=2.2 pounds
    1 mole of carbon= 12X10^-3 kg
    1 mole=6X10^23 atoms
    1eV=1.6X10^-19 J

    Take the efficiency of conversion from chemical energy to electrical energy to be N=0.41(N represents efficiency). Compare your answer for the available energy to the one we found in class. Assuming that the cold reservoir for the particular heat engine used is at 20C, estimate the temperature at which the coal burns. Note that these calculations connect energy production in a coal plant all the way to fundamental chemistry and physics.

    2. Relevant equations

    E (generator)= η (total efficiency) x E (coal). But I'm almost sure that this is the wrong equation.

    3. The attempt at a solution
    I'm drawing a blank. Could someone please guide me?
  2. jcsd
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