## Value of R

AlyssaPeckham1A
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### Value of R

Is the value of R in PV=nRT always equal to .082?

Silvino Jimenez 1A
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

### Re: Value of R

Value of R is the Gas Constant
Attachments 905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

### Re: Value of R

Be careful not to mix up this constant with Ryderberg's constant. The use of the same letter for their abbreviation often leads to confusion.

HussainNaib1D
Posts: 9
Joined: Fri Apr 06, 2018 11:04 am

### Re: Value of R

Yes, R in the equation PV=nRT is a constant so it is always equal to the same value. However, you have to match the value of R in terms of the units of the other values in the equation (P, V, n, and T). The units of R when it is equal to 0.082 is L/atm/K^-1/mol^-1, so in order to use .082 for R, V must be in liters, P must be in atmospheres, T must be in Kelvin, and n must be in mol (which is usually the case, hence why we use .082 for R most of the time).