### PV=nRT

Posted:

**Sat Jan 19, 2019 1:04 pm**I understand that n/v is equal to concentration, but what exactly do we use the ideal gas law for in chemical equilibrium? Also, if we have to find P, will we be given R and T?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=123&t=40225

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Posted: **Sat Jan 19, 2019 1:04 pm**

I understand that n/v is equal to concentration, but what exactly do we use the ideal gas law for in chemical equilibrium? Also, if we have to find P, will we be given R and T?

Posted: **Sat Jan 19, 2019 1:35 pm**

Hi Ryan,

I think we use PV=nRT to support Le Chatelier's principle, but there isn't much else on where you'd use it in class. However, we may have to use the concentration to calculate P, such as in P = (conc) * RT given temperature. R is a constant.

I think we use PV=nRT to support Le Chatelier's principle, but there isn't much else on where you'd use it in class. However, we may have to use the concentration to calculate P, such as in P = (conc) * RT given temperature. R is a constant.

Posted: **Sat Jan 19, 2019 2:27 pm**

R is always a constant, so it will always be given. I think we may use the ideal gas law to convert from K_{c} to K_{p} or to find concentration when given pressure.

Posted: **Sat Jan 19, 2019 3:15 pm**

We use the ideal gas law to convert between partial pressure and molar concentration. R is a constant, therefore it will always be give and T will most probably be given in order to find either P or n/v.

Posted: **Sat Jan 19, 2019 5:20 pm**

PV = nRT shows the relationship between pressure and concentration so it would be used to convert Kp to Kc and vice versa.

Posted: **Sun Jan 20, 2019 11:00 pm**

For most problems R and T are constants and will be given in the problem. This formula is generally used to find pressure or concentration.

Posted: **Mon Jan 21, 2019 3:26 pm**

The ideal gas law is used in order to convert from molarity to partial pressure, with K and R being given

Posted: **Sat Jan 26, 2019 12:36 pm**

If you need to solve a PV=nRT equation, temperature will almost always be given. Also, R is a constant on our sheet, you just need to figure out which R works in the situation (whether or not the problem is asking in bar or atm).

Posted: **Sat Mar 16, 2019 1:07 pm**

ideal gas law can also be used to find one part of the equation to put into another equation or sometimes to directly substitute into an equation