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Fatemah Yacoub 1F
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Postby Fatemah Yacoub 1F » Wed Jan 08, 2020 11:07 pm

In 5G.7 why did they write K in terms of Kc if all the products and reactants are gases? Should it be in terms of Kp?

Posts: 43
Joined: Wed Sep 18, 2019 12:17 am

Re: 5G.7

Postby ng1D » Thu Jan 09, 2020 12:11 am

Kp is the partial pressure equilibrium constant, which would be used for gases, but partial pressure can be converted into concentration of a gas by using the ideal gas law. I think because partial pressure can be converted into concentration, Kc can be used for gases.

Jainam Shah 4I
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Joined: Fri Aug 30, 2019 12:16 am

Re: 5G.7

Postby Jainam Shah 4I » Thu Jan 09, 2020 1:16 am

If you remember the manipulation of the ideal gas equation we can go from the partial pressure to the concentration of a reactant or product and vice-versa. This is why even though all the products and reactants are in the gas phase the book provides the Kc expression. If you were doing calculations it would be easier to see what values are given then decide which equilibrium constant to use.

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