### R in PV=nRT

Posted:

**Mon Jan 07, 2019 11:10 pm**What does the R represent in the equation PV=nRT? and what are the units?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=123&t=39421

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Posted: **Mon Jan 07, 2019 11:10 pm**

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

Posted: **Mon Jan 07, 2019 11:17 pm**

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

Posted: **Mon Jan 07, 2019 11:57 pm**

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

Posted: **Tue Jan 08, 2019 12:05 am**

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)

Posted: **Tue Jan 08, 2019 5:02 pm**

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!

Posted: **Tue Jan 08, 2019 5:22 pm**

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.

Posted: **Tue Jan 08, 2019 6:04 pm**

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)

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)

Posted: **Mon Jan 14, 2019 2:57 pm**

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.

Posted: **Mon Jan 14, 2019 3:10 pm**

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

Posted: **Mon Jan 14, 2019 3:19 pm**

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.

Posted: **Mon Jan 14, 2019 9:27 pm**

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

Posted: **Wed Jan 16, 2019 1:00 pm**

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

Posted: **Thu Jan 09, 2020 9:05 pm**

R is the universal gas constant, sometimes known as the Regnault constant. The value of the R constant is 8.3144598 J/mol·K.

Posted: **Thu Jan 09, 2020 9:13 pm**

R is the gas constant but it can use different units such as torr, atm, or bar

Posted: **Fri Jan 10, 2020 3:49 pm**

Dr. Lavelle's website also provides the constants and formulas that we will receive for test and exams.

https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

Posted: **Fri Jan 10, 2020 3:55 pm**

R is the Universal Gas Constant. It is described in the textbook as well. The values can be in different units of pressure. It is 8.314 J/molK, 0.082L-atm/ molK, or 62.36L-torr/molK.

Posted: **Fri Jan 10, 2020 3:57 pm**

R is a gas constant and the numerical value depends on the units being used to measure the gas

Posted: **Fri Jan 10, 2020 4:06 pm**

R is the Ideal Gas Constant which has the value of 8.314J/molK.

Posted: **Fri Jan 10, 2020 4:15 pm**

R is the ideal gas constant, which will probably be given to us on a test/exam.

Posted: **Fri Jan 10, 2020 4:25 pm**

R is a gas constant that is on the constants and formulas sheet that we get on tests (also on Lavelle's website)

R= 8.314 J·K-1·mol-1 = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1= 62.364 L·Torr·K-1·mol-1

R= 8.314 J·K-1·mol-1 = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1= 62.364 L·Torr·K-1·mol-1

Posted: **Fri Jan 10, 2020 5:36 pm**

There are different values and units that will vary based on the units of the other variables given in a certain equation. We will probably get these on the formula sheet just like lavelle's 14a

Posted: **Fri Jan 10, 2020 10:44 pm**

It's a constant and should be given with any exams so I don't think we need to worry too much about it.

Posted: **Fri Jan 10, 2020 10:51 pm**

The R represents the ideal gas constant.

Depending on units, it is equal to R=8.314 J·K-1·mol-1= = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1.

Depending on units, it is equal to R=8.314 J·K-1·mol-1= = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1.

Posted: **Fri Jan 10, 2020 11:51 pm**

R is the gas constant. I believe it will be given on the equation/constant sheet on tests.

Posted: **Sat Jan 11, 2020 1:00 pm**

it is the gas constant and can either be seen as 8.314 J/mol·K or 0.082057 L⋅atm/mol⋅K

Posted: **Sat Jan 11, 2020 3:01 pm**

R is a gas constant and should be given to you on the formula sheet for tests.

Posted: **Sat Jan 11, 2020 3:10 pm**

R is the gas constant with a value of 8.314 (J)/((Mol)(K))

Posted: **Sat Jan 11, 2020 3:56 pm**

R refers to the gas constant which depends on the units you are using for your equation.

Posted: **Sat Jan 11, 2020 4:39 pm**

Millicent Navarro 1I wrote: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.

When do we use the ideal gas law equation? How does it relate to K

Posted: **Sun Jan 12, 2020 1:49 pm**

The R is a constant, you can find it on the equation sheet. Just pay attention to which unit of pressure they are using.

Posted: **Sun Jan 12, 2020 2:54 pm**

R is the gas constant and it equals 8.314 J / mol·K.

Posted: **Sun Jan 12, 2020 2:59 pm**

R just represents the gas constant, which is 8.314 J.mol^{-1}.K^{-1}

Posted: **Sun Jan 12, 2020 3:52 pm**

R is the gas constant, and depending on the units you have in your problem you have to choose a certain R value.

R = 8.314 J·K-1·mol-1 = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1

= 62.364 L·Torr·K-1·mol-1

R = 8.314 J·K-1·mol-1 = 8.206 x 10-2 L·atm·K-1·mol-1 = 8.314 x 10-2 L·bar·K-1·mol-1

= 62.364 L·Torr·K-1·mol-1

Posted: **Sun Jan 12, 2020 4:38 pm**

R is the gas constant, should be found on the equations sheet

Posted: **Sun Jan 12, 2020 4:43 pm**

The R in PV=nRT stands for the gas constant and its units are 8.314 J/mol·K.