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Chemistry Equilibrium Kc

  1. Feb 13, 2019 #1
    1. The problem statement, all variables and given/known data
    Kc = 1.37 for HI(g) ↔ 1/2 H2(g) + 1/2 I2(g). What is Kc (to 3 decimal places) for H2(g) + I2(g) ↔ 2HI(g)?

    2. Relevant equations
    Kc= Products/Reactants, Ice Tables

    3. The attempt at a solution
    I tried an ice table, but I’m not sure what to do with the Kc value I’m given when I have to another Kc value
     
  2. jcsd
  3. Feb 13, 2019 #2

    Wrichik Basu

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    2018 Award

    $$K_{c_1} = 1.37 = \dfrac{[H_2]^{1/2} [I_2]^{1/2}}{[HI]}$$ and $$K_{c_2} = \dfrac{[HI]^2}{[H_2][I_2]}$$ Can you find a relation between ##K_{c_1}## and ##K_{c_2}##?
     
  4. Feb 13, 2019 #3
    I know the reaction reversed and doubled. But I don’t know how to solve for Kc mathematically with this set-up.
     
  5. Feb 13, 2019 #4

    Wrichik Basu

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    2018 Award

    What maths are you referring to? If you can find ##K_{c_2}## in terms of ##K_{c_1}##, then can't you find ##K_{c_2}##?
     
  6. Feb 13, 2019 #5
    What do you get if you square @Wrichik Basu's first equation, and then multiply it by his second equation.
     
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