### PV = nRT Confusion

Posted:

**Sun Jan 12, 2020 5:33 pm**When do we use PV = nRT, I am confused about what this is for? Can someone explain this? Thanks :)

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=123&t=56087

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Posted: **Sun Jan 12, 2020 5:33 pm**

When do we use PV = nRT, I am confused about what this is for? Can someone explain this? Thanks :)

Posted: **Sun Jan 12, 2020 5:38 pm**

PV = nRT is the ideal gas law, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature in K. In the context of this unit, we can use it to convert between partial pressures and molar concentrations by rearranging the equation as follows: P = (n/v)RT = (concentration)RT, or vice versa through concentration = P/RT. By doing this, we can convert between Kc and Kp.

Be careful which value of R you use and pay attention to the units by checking whether the pressure is given in atm/bar, mmHg, etc. You can also use the ideal gas equation to convert between any of the variables (pressure, volume, etc).

Be careful which value of R you use and pay attention to the units by checking whether the pressure is given in atm/bar, mmHg, etc. You can also use the ideal gas equation to convert between any of the variables (pressure, volume, etc).

Posted: **Sun Jan 12, 2020 5:41 pm**

PV=nRT is the ideal gas equation. it can be used to convert between partial pressure and concentration for a gas, which means it can help us find Kc from Kp and vice versa.

Posted: **Sun Jan 12, 2020 7:41 pm**

By rearranging the ideal gas equation, n/v can be isolated for which means that the concentration can be calculated for because n/v is the concentration/molarity.

Posted: **Sun Jan 12, 2020 8:50 pm**

PV=nRT, the ideal gas equation, can be used to solve for any of the values in the equation if a question asks for it or converting between pressure and molarity.