## Clarification on R and P Calculations

Achang1L
Posts: 13
Joined: Wed Sep 21, 2016 2:59 pm

### Clarification on R and P Calculations

So when there are brackets surrounding the R and P, it means to put in the molar masses, but when you're looking for Kp, you use the pressure of each element?

michaeljwilson3
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Clarification on R and P Calculations

I also have a question. Why is it that solids and liquids are not included in the R and P calculations?

Alyssa Chan 3B
Posts: 16
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Clarification on R and P Calculations

The brackets indicate the molar concentrations of the R and P, not molar masses.
Kp measures equilibrium for gas pressures, so you use the partial pressures of R and P.

Solids and liquids aren't included in the equilibrium calculations because their molar concentrations don't change in a reaction.

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