April 17, 2024, 11:17:32 PM
Forum Rules: Read This Before Posting


Topic: How to calculate Kp  (Read 20413 times)

0 Members and 1 Guest are viewing this topic.

Offline sparkly

  • Regular Member
  • ***
  • Posts: 11
  • Mole Snacks: +0/-0
How to calculate Kp
« on: March 23, 2009, 11:18:58 AM »
The only way the book showed to do equilibrium is to do Keq = [A]^a [ B]^b / [C]^c
but that isnt even possible here. When I asked the teacher, he said I should be able to do this with some basic Algebra I. I am completely lost. Please help

 Consider the equilibrium

N2(g) + O2(g) + Br2(g) <===> 2 NOBr(g)

Calculate the equilibrium constant Kp for this reaction, given the following information (at 298 K):

2 NO(g) + Br2(g) <===> 2 NOBr(g) Kp = 0.49

2 NO(g) <===> N2(g) + O2(g) Kp = 2.1 x 1030
« Last Edit: March 23, 2009, 01:02:09 PM by Borek »

Offline sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 3652
  • Mole Snacks: +222/-42
  • Gender: Male
Re: How to calculate Kp
« Reply #1 on: March 23, 2009, 12:43:22 PM »
Note that [ B ] (without the spaces) is a formatting code for bold text, but that's a software issue.

Consider your first equilibrium, what is your expression for Keq, and then similarly with the partial equilibriums you list later?

Offline Las

  • Regular Member
  • ***
  • Posts: 34
  • Mole Snacks: +1/-0
Re: How to calculate Kp
« Reply #2 on: March 24, 2009, 07:52:12 AM »
are you sure there's enough information here to do this question? :(

Offline sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 3652
  • Mole Snacks: +222/-42
  • Gender: Male
Re: How to calculate Kp
« Reply #3 on: March 24, 2009, 07:57:14 AM »
are you sure there's enough information here to do this question? :(

Yes!

What's the expression for Kp for the reaction 2 NO(g) + Br2(g)  ::equil:: 2 NOBr(g) ?

Repeat for the other reactions, and see where that gets you.

Offline Las

  • Regular Member
  • ***
  • Posts: 34
  • Mole Snacks: +1/-0
Re: How to calculate Kp
« Reply #4 on: March 24, 2009, 08:09:22 AM »
LOL..I got it:) that's one funny question :P All you have to know is how to write the expressions for Kp:)

Sponsored Links