Equilibrium constant problem

  • Thread starter Spallation
  • Start date
  • #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.
 
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Answers and Replies

  • #2
tiny-tim
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Welcome to PF!

Hi Spallation! Welcome to PF! :smile:

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

Thanks for the welcome :)
 
  • #4
tiny-tim
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erm … 0.000028836 is just the top line!! :biggrin:
 
  • #5
Woah so it is, what a mistake to make, my new answer is 500640625.
 
  • #6
5,439
9
I agree with Tiny Tim your arithmetic is 13 orders of magnitude adrift. This is more than a rounding error.
 
  • #7
tiny-tim
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Woah so it is, what a mistake to make, my new answer is 500640625.
:biggrin: Woohoo! :biggrin:

(and you were only out originally by about 1014 ! o:))
 
  • #8
Indeed, how embarrasing! Thank you for the help.
 

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