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Homework Help: Partial Pressures of ethanal and water

  1. Oct 31, 2007 #1
    Partial Pressures of ethanal and water!!

    Hello, I need help with a physical chemistry fundamentals problems:

    1.CH3CH2OH (s)+O2-->CH3CHO+H2O (l)

    a) the equilibrium constant for the reaction...K=e^(-deltaG/RT)...is this is the right equation for solving K?
    b) what will be the partial pressures of ethanal and water in equilibrium with 1.00 bar each of ethanol and oxygen??....Pj=xjP where p is 100kPa; I can't seem to figure out a way to begin solving (b)

    2. A buffer solution of Tris (pKa=8.3 @ 20C) was prepared by combining 100.oo mL of 0.500 M Tris with 150.00 mL of 0.500 M Tris+ in a 500.00 mL volumetric flask and diluting to the line with water

    a) pH of this buffer? ........Would it be pH 8.3 (same as pH)
    b) What will be the pH after addition of 5.5 mmol of HCI to 100.00 mL of this buffer....would it be pH=pKa-log (acid/base)

    Please help someone, anyone.....THANKS!!!!!
  2. jcsd
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