Explaining pressure increase in terms of concentration

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Samantha Chung 4I
Posts: 77
Joined: Wed Oct 03, 2018 12:16 am

Explaining pressure increase in terms of concentration

Postby Samantha Chung 4I » Fri Jan 18, 2019 10:57 pm

Since we should avoid using the comparison of number of moles of gas to explain our logic, for instance in HW problem (7th edition 5J 5). How do we explain whether the following will lead to more products or reactants?

2O3g) -> 3O2(g)

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Explaining pressure increase in terms of concentration

Postby 804994652 » Sat Jan 19, 2019 1:13 am

increasing pressure favors the side with fewer moles of gas, in this case it would be reactants

AngelaZ 1J
Posts: 65
Joined: Fri Sep 28, 2018 12:23 am

Re: Explaining pressure increase in terms of concentration

Postby AngelaZ 1J » Sat Jan 19, 2019 7:42 pm

If pressure is increased by decreasing volume, then concentration increases (C=n/V). We can calculate Q using the new concentrations and compare that with K to see which way the reaction shifts. In this case, we can look at [O2]^3/[O3]^2 to know that increasing concentration would cause Q>K and the reaction would shift left.


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