## Equilibrium partial pressures

juchung7
Posts: 44
Joined: Fri Sep 29, 2017 6:05 am

### Equilibrium partial pressures

For question 63 in chapter 11
At 25 C, K =3.2 x 10^-34 for the reaction 2 HCl(g) <-> H2(g) + Cl2(g). If a 1.0-L reaction vessel is filled with HCl at 0.22 bar, what are the equilibrium partial pressures of HCl, H2, and Cl2?

Do you have to solve this by first calculating number of moles of HCl using PV=nRT and then later converting moles of H2 and Cl2 back to pressure? Or can you just use pressure and K to solve for the partial pressures?

Sabah Islam 1G
Posts: 50
Joined: Sat Jul 22, 2017 2:01 am

### Re: Equilibrium partial pressures

Since the question is asking for the equilibrium partial pressures, it would not be necessary to calculate the number of moles using PV=nRT. You would just have to use the pressure of HCl that is already given, do the ICE table, and use K, which would compute the partial pressures.

Posts: 58
Joined: Fri Sep 29, 2017 6:04 am

### Re: Equilibrium partial pressures

Dr Lavelle mentioned that you can use partial pressure in ice boxes, so you do not have to convert unless it asks.

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