R in PV=nRT

$PV=nRT$

sallina_yehdego 2E
Posts: 75
Joined: Sun Apr 29, 2018 3:00 am

R in PV=nRT

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

Jesse Kuehn 1B
Posts: 40
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: 92
Joined: Fri Sep 28, 2018 12:16 am

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: 165
Joined: Fri Sep 28, 2018 12:16 am

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: 72
Joined: Fri Oct 12, 2018 12:16 am

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: 65
Joined: Fri Sep 28, 2018 12:17 am

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: 31
Joined: Fri Sep 28, 2018 12:22 am

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: 61
Joined: Fri Sep 28, 2018 12:25 am

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
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Joined: Fri Sep 28, 2018 12:26 am
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: 60
Joined: Fri Sep 28, 2018 12:24 am

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: 72
Joined: Fri Sep 28, 2018 12:28 am

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: 66
Joined: Fri Sep 28, 2018 12:15 am

Re: R in PV=nRT

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