Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Equilibrium constant problem

  1. May 15, 2010 #1
    Determine the equilibrium constant, my working is below:

    Equilibrium reaction:
    [PLAIN]http://img34.imageshack.us/img34/5106/reactiondy.jpg [Broken]

    At 730 oC the equilibrium concentrations of reactants and products are:

    [H2 (g) ] / mol dm-3 : 2.40 x 10-7

    [Cl2 (g)] / mol dm-3 : 2.40 x 10-7

    [HCl (g)] / mol dm-3: 5.37 x 10-3

    [PLAIN]http://img163.imageshack.us/img163/4485/equationconstant.jpg [Broken]




    My answer is wrong but I don't know why, I must have missed something out. Thanks for any explanations I receive.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 15, 2010 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi Spallation! Welcome to PF! :smile:

    Your arithmetic is wrong … how did you get 2.9 10-5 ? :confused:
     
  4. May 15, 2010 #3
    I rounded to two significant figures and put it in scientific notation from the answer 0.000028836

    Thanks for the welcome :)
     
  5. May 15, 2010 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    erm … 0.000028836 is just the top line!! :biggrin:
     
  6. May 15, 2010 #5
    Woah so it is, what a mistake to make, my new answer is 500640625.
     
  7. May 15, 2010 #6
    I agree with Tiny Tim your arithmetic is 13 orders of magnitude adrift. This is more than a rounding error.
     
  8. May 15, 2010 #7

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    :biggrin: Woohoo! :biggrin:

    (and you were only out originally by about 1014 ! o:))
     
  9. May 15, 2010 #8
    Indeed, how embarrasing! Thank you for the help.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Equilibrium constant problem
  1. Equilibrium constant (Replies: 8)

  2. Equilibrium constant? (Replies: 1)

  3. Equilibrium constant (Replies: 1)

  4. Equilibrium Constants (Replies: 4)

Loading...