Compressing a Reaction Mixture

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Mike Matthews 1D
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Joined: Fri Sep 29, 2017 7:04 am

Compressing a Reaction Mixture

Postby Mike Matthews 1D » Mon Nov 27, 2017 9:28 pm

I'm confused by the book's statement, "Compression of a reaction mixture at equilibrium tends to drive the reaction in the direction that reduces the number of gas phase molecules; increasing the pressure by introducing an inert gas has no effect on equilibrium." Doesn't compression increase pressure? If so then how come compression changes the reaction mixture while increasing pressure by adding an inert gas does not?

Andrea Grigsby 1I
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

Re: Compressing a Reaction Mixture

Postby Andrea Grigsby 1I » Mon Nov 27, 2017 9:52 pm

adding inert gas doesn't change the concentration of the reactants/products as the moles and the volume of R and P remain constant
while increasing the pressure, and thus decreasing the volume does - C=n/V
so because the number of moles of the reactants/products remain the same but the volume decreases, the concentration of the side with the least amount of moles increases

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