[flaren5]

Good day all,  I am ineed of some help on the following question.  I thought I was understanding these types of question but now I seem to be confused.  Any help is greatly appreciated.

Question:

The decompostion of N2O4 at 298K,

N2O4(g) <--->  2NO2 (g)

has Kc=4.61x10^-3.  A 2.00L vessel contained 0.0466 mol N2O4 at equilibrium. Calculate the concentration of NO2 in the vessel.

[sjb]

Good day all,  I am ineed of some help on the following question.  I thought I was understanding these types of question but now I seem to be confused.  Any help is greatly appreciated.

Question:

The decompostion of N2O4 at 298K,

N2O4(g) <--->  2N2O2 (g)

has Kc=4.61x10^-3.  A 2.00L vessel contained 0.0466 mol N2O4 at equilibrium. Calculate the concentration of NO2 in the vessel.

NO₂, presumably, not N₂O₂? What is your expression for Kc?

[flaren5]

Oooops...I did make a mistake when inputing the info...the following question is the CORRECT information.

Question:

The decompostion of N2O4 at 298K,

N2O4(g) <---> 2NO2 (g)                    Kc=4.61x10^-3. 

A 2.00L vessel contained 0.0466 mol N2O4 at equilibrium. Calculate the concentration of NO2 in the vessel.

Thank you for any insight!!

[fledarmus]

How would you start? For example, what does the equilibrium constant tell you about the relative concentrations of your materials?

[flaren5]

I'm not too sure how to start.  I was thinking that i was to use an ICE table, and then plug the Kc into the equation.  I'm literally at a hault on how to proceed with this question.  If I had a similar question to refer to then I probably would be able to figure it out.  Unfortunately I'm dumbfounded!! 

[Borek]

Write formula for Kc.

What is concentration of N₂O₄?

What is known?

What is unknown?

How many unknowns?

Yes, it is THAT simple.

[flaren5]

Thank you...as per usual with me I was trying to make something so simplistic into something so complicated. 
I believe that I have figured it out, with your help of course.  If I understood correctly then the answer I got for NO2 concentration is 1.04 x 10^-2.

Does this sound possible?

[Borek]

Yes.