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Homework Help: Theromodynamics: energy from biological oxydation of alanine

  1. Oct 27, 2009 #1
    The [tex]\delta[/tex] Hcombustion for alanine is -1577kJ mol-1 and the [tex]\delta[/tex] Hcombustion for urea is -631.6kJmol-1. The product of biological combustion of alanine is urea ((H2N)2CO) and not N2.

    Balance the following: (provided balanced)

    2 C3H7NO2 + [tex]\frac{15}{2}[/tex]O2[tex]\rightarrow[/tex] 6CO2 + 7H2O + N2

    1 (H2N)2CO + [tex]\frac{3}{2}[/tex]O2 [tex]\rightarrow[/tex] CO2 + 2H2O +N2

    2C3H7NO2 + 6O2 [tex]\rightarrow[/tex] 5CO2 + 5H2O + (H2N)2CO

    What is the amount of energy available from the biological oxidation of 1.000 g of alanine

    n C3H7NO2 per 1.000 g = 0.011 mol

    [tex]\delta[/tex]Hrxn 3= [tex]\delta[/tex]Hrxn 1 - [tex]\delta[/tex]Hrxn 2 = -945.4 kJ mol-1 ...............this is for 2 moles

    Amount of energy available is 0.011* (-945.4 / 2) ???? Can you please let me know if this should be the answer?
    Last edited: Oct 27, 2009
  2. jcsd
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