CHEMISTRY COMMUNITY

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?

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.

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.

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.

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

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.

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

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).

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