## R in PV=nRT

$PV=nRT$

sallina_yehdego 2E
Posts: 61
Joined: Sun Apr 29, 2018 2:00 am

### R in PV=nRT

What does the R represent in the equation PV=nRT? and what are the units?

Jesse Kuehn 1B
Posts: 30
Joined: Wed Nov 14, 2018 12:23 am

### Re: R in PV=nRT

It is the called the gas constant and the SI unit for it is J K^-1 mol^-1

Nathan Tran 4K
Posts: 76
Joined: Thu Sep 27, 2018 11:16 pm

### Re: R in PV=nRT

It's essentially a constant usually equal to 8.315 JK^-1mol^-1. I am sure it will be on our constant sheet.

Matthew Tran 1H
Posts: 124
Joined: Thu Sep 27, 2018 11:16 pm

### Re: R in PV=nRT

Depending on the units of pressure and volume, R can take on different values. A common example is when you are given P in atm (atmospheres) and V in L (liters). In this case R=0.0821(atm*L)/(mol*K)

JiangJC Dis2K
Posts: 60
Joined: Thu Oct 11, 2018 11:16 pm

### Re: R in PV=nRT

R is a constant in the ideal gas law (PV=nRT) and has multiple unit derrivations that can all be found on the equations and constants sheet! So no need to memorize the value or units!

Emily Ng_4C
Posts: 53
Joined: Thu Sep 27, 2018 11:17 pm

### Re: R in PV=nRT

R is the gas constant and it is important to note that it differs depending on whether atm, torr, or bar is used for the pressure unit.

Felicia1E
Posts: 19
Joined: Thu Sep 27, 2018 11:22 pm

### Re: R in PV=nRT

Different problems will have different units, so as long as you match the unit to the corresponding R value you should be good. Here is a list with some R values:

0.0821 (atm L)/(mol K)
0.0831 (bar L)/(mol K)
8.314 (J)/(K mol)
62.36 (torr L)/(mol K) or (mmHg L)/(mol K)
1.987 (cal)/ (mol K)

Millicent Navarro 1I
Posts: 53
Joined: Thu Sep 27, 2018 11:25 pm

### Re: R in PV=nRT

PV=nRT is the Ideal Gas Law equation. To answer your question, the R is the ideal gas law constant and there are varying corresponding values (for the most part, problems will specify which value to use.) Some examples can include bar or atm.

705170809
Posts: 46
Joined: Thu Sep 27, 2018 11:26 pm
Been upvoted: 1 time

### Re: R in PV=nRT

R is gas constant, but the units can be different like atm, torr, or bar.

Brian Hom 2F
Posts: 51
Joined: Thu Sep 27, 2018 11:24 pm

### Re: R in PV=nRT

The ideal gas law is PV = nRT, where n is the number of moles, and R is universal gas constant. The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol. It is just a constant to use in the equation.

Ahmed Mahmood 4D
Posts: 50
Joined: Thu Sep 27, 2018 11:28 pm

### Re: R in PV=nRT

R is a constant known as the gas constant. Its units are represented as Joules . mol^-1 and various other units such as atmospheres.

ran2000
Posts: 60
Joined: Thu Sep 27, 2018 11:15 pm

### Re: R in PV=nRT

R is the ideal gas constant 8.314 J/(K mol)