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Homework Help: Thermodynamics of Reactions with Glucose

  1. Feb 11, 2010 #1
    1. The problem statement, all variables and given/known data
    ps4n2.jpg


    2. Relevant equations
    ΔH rxn = ΔH products - ΔH reactants
    ΔU = q + w


    3. The attempt at a solution
    Pretty overwhelmed with the entire problem. Since the ΔH's of all reactants and products were in the literature for the reference temperature of 298.15 K, I was able to plug them in and get the value for that temperature. I am not sure how it changes with temperature increase?

    Can anyone point me in the right direction?
     
  2. jcsd
  3. Feb 12, 2010 #2

    chemisttree

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    Perhaps heat capacity(-ies) is the reason where delta T = 298.15 K - 330.15 K.
     
  4. Feb 15, 2010 #3
    Ah, okay I was able to the the change in enthalpy for 330.15 K by Hess's law, and adding delta H rxn (298.15K) to the integral of delta Cp dT integrated from To to T.

    Now I'm stuck on b. part ii. I can't find any examples anywhere on calculating problems like this and my professor is so highly educated (MIT, Harvard, UPenn) that I can't understand him.

    Ahh, any help is appreciated!
     
  5. Feb 16, 2010 #4

    chemisttree

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    It lies somewhere in Table 4.1 and 4.2. That will get you started.
     
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