Chemical Equilibrium 11.3

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Delilah Naranjo dis 3j
Posts: 34
Joined: Wed Sep 21, 2016 3:00 pm

Chemical Equilibrium 11.3

Postby Delilah Naranjo dis 3j » Thu Nov 17, 2016 5:29 pm

How do we know when to find Partial pressure? For question 11.3 in the book it asks: Write the equilibrium expression K for each of the following reactions
A. 2C2(h4)(g)+O2(g) ------> <-------- 2C2(h4)Cl2(g)=2(h2)O(g)

I know that you have to get products over reactants but in the answer it has P[C2H4Cl2]^2[H2O]^2/P[C2H4]^2[O2][HCl]^4

why does it have the Ps in the answer when it just asks for the equilibrium expression for k and not the partial pressure.

Andrew Nguyen 3G
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

Re: Chemical Equilibrium 11.3

Postby Andrew Nguyen 3G » Thu Nov 17, 2016 7:38 pm

Kp uses P instead of brackets by convention. Usually, brackets are used to represent concentration in a solution (Kc), whereas Kp uses P to show partial pressure - that is, the pressure exerted by its constituents. Concentration in solution is different than partial pressure exerted.

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