calculating value of K

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martha-1I
Posts: 76
Joined: Fri Sep 26, 2014 2:02 pm

calculating value of K

Postby martha-1I » Sat Nov 29, 2014 12:24 pm

How would I calculate the value of K when given that the initial pressure of X2 was 0.10 bar? I was thinking of using ICE but I'm not quite sure how or if that is the right way to approach this problem. This is the question for part C of 10.5.

Sophie Sha 1A
Posts: 10
Joined: Fri Sep 26, 2014 2:02 pm

Re: calculating value of K

Postby Sophie Sha 1A » Sun Nov 30, 2014 4:33 pm

Hi, this is how I did the question:

I first wrote the reaction X2 <-> 2X because the problem tells us that X2 is dissociating over time.
Next, we have to find the partial pressure of X and X2, given the initial pressure of X2 is 0.1 bar.
The partial pressure of X=(mole fraction of X)(initial pressure)
The partial pressure of X2=(mole fraction of X2)(initial pressure)
So K=(Partial pressure of X)^2/(Partial pressure of X2)
=((12/17)(0.1))^2/((5/17)(0.1))
=0.2

Hope this helped!


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