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Topic: decomposition of gases giving the Kc???  (Read 2059 times)

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Offline L4R4

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decomposition of gases giving the Kc???
« on: October 07, 2010, 08:48:46 AM »
A 3L flask initially contains 1.533 mol of gas A and 0.4619 mol of gas B. Gas A decomposes according to:
3A <-> 2B + C
The equilibrium concentration of gas C is 0.1mol/L
Calculate the value of Kc?
I know that Kc = [ B]^2 [C] / [A]^3 but since we don't have either A or B concentrations at equilibrium we can't use it! I dont understand!
Thank you so much for helping.
« Last Edit: October 07, 2010, 05:50:54 PM by Borek »
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Offline sjb

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Re: decomposition of gases giving the Kc???
« Reply #1 on: October 07, 2010, 12:45:01 PM »
Well, you have a concentration of C, and so an amount of C; From this you can get a created amount of B from the reaction by stoichoimetry, and so an amount of A used up...?
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