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Homework Help: Equilibrium physics help

  1. Feb 22, 2007 #1
    1. The problem statement, all variables and given/known data

    In an experiment , b mole of hydrogen iodide were put into a sealed vessel under pressure p . At equilibrium, x mole of the hydrogen iodide had dissociated , the reaction being represented by the following equation ,
    Express in terms of b and x of Kp .

    2. Relevant equations

    2HI(g) <---> H2(g) + I2(g)

    3. The attempt at a solution
    Here is my solution :
    Before experiment : b mole of hydrogen iodide under pressure , p
    At equilibrium : x mole of hydrogen iodide
    P(pressure) for hydrogen iodide : [(p/b).(x)]^2

    Before experiment : unknown
    At equilibrium : I conclude that mole ratio of total products is the ( b-x )
    mol . Therefore ,
    P(pressure) for gas hyrogen and gas iodine : [(b-x).(p/b)]^2

    Kp = ([(b-x).(p/b)]^2 ) / ([(p/b).(x)]^2)
    = (b^2) / (b-x)^2

    If I am wrong , please guide me .
  2. jcsd
  3. Feb 22, 2007 #2
    Nobody guide me here ?
  4. Feb 23, 2007 #3
    Somebody help me please .
  5. Feb 23, 2007 #4


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    Staff Emeritus
    Science Advisor
    Gold Member

    Pay careful attention to the question: "x mole of the hydrogen iodide had dissociated ".
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