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Homework Help: Physical Chemistry problem,please help!

  1. Feb 15, 2007 #1
    Can someone help me with this problem?

    Things that are given: ΔHf:enthalpy change ΔGf:Gibbs energy change

    for p=1atm and T=25 C

    ΔHf(kcal/mol) ΔGf(kcal/mol)
    H2O(g) -57.79 -54.63
    H2O(l) -68.32 -56.69

    Find
    1)Vapour pressure of H20 at T=25 C
    2)Vapour pressure of H2O at T=50 C
    3)The maximum work (kJ/mol) that we can take with electrochemical burn of H2 on a fuel cell at T=25 C:
    H2(g)+1/2O2(g)=H20(l)
    4)The heat,Q,that goes out on the surrender(kJ/mol) for the 3rd problem
    5)How much kg H2 are required for a car with 100HP to travel a distance of 500km in 4h?
    6)What is the ΔS of H2(g)+1/2O2(g)=H2O(g)?

    Sorry for the bad english!I would highly appreciate it if someone could help me...
     
  2. jcsd
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