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R in PV=nRT

Posted: Mon Jan 07, 2019 11:10 pm
by sallina_yehdego 2E
What does the R represent in the equation PV=nRT? and what are the units?

Re: R in PV=nRT

Posted: Mon Jan 07, 2019 11:17 pm
by Jesse Kuehn 1B
It is the called the gas constant and the SI unit for it is J K^-1 mol^-1

Re: R in PV=nRT

Posted: Mon Jan 07, 2019 11:57 pm
by Nathan Tran 4K
It's essentially a constant usually equal to 8.315 JK^-1mol^-1. I am sure it will be on our constant sheet.

Re: R in PV=nRT

Posted: Tue Jan 08, 2019 12:05 am
by Matthew Tran 1H
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)

Re: R in PV=nRT

Posted: Tue Jan 08, 2019 5:02 pm
by JiangJC Dis2K
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!

Re: R in PV=nRT

Posted: Tue Jan 08, 2019 5:22 pm
by Emily Ng_4C
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.

Re: R in PV=nRT

Posted: Tue Jan 08, 2019 6:04 pm
by Felicia1E
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)

Re: R in PV=nRT

Posted: Mon Jan 14, 2019 2:57 pm
by Millicent Navarro 1I
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.

Re: R in PV=nRT

Posted: Mon Jan 14, 2019 3:10 pm
by 705170809
R is gas constant, but the units can be different like atm, torr, or bar.

Re: R in PV=nRT

Posted: Mon Jan 14, 2019 3:19 pm
by Brian Hom 2F
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.

Re: R in PV=nRT

Posted: Mon Jan 14, 2019 9:27 pm
by Ahmed Mahmood 4D
R is a constant known as the gas constant. Its units are represented as Joules . mol^-1 and various other units such as atmospheres.

Re: R in PV=nRT

Posted: Wed Jan 16, 2019 1:00 pm
by ran2000
R is the ideal gas constant 8.314 J/(K mol)

Re: R in PV=nRT

Posted: Thu Jan 09, 2020 9:05 pm
by Eva Zhao 4I
R is the universal gas constant, sometimes known as the Regnault constant. The value of the R constant is 8.3144598 J/mol·K.

Re: R in PV=nRT

Posted: Thu Jan 09, 2020 9:13 pm
by Lizette Noriega 1H
R is the gas constant but it can use different units such as torr, atm, or bar

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 3:49 pm
by VLi_2B
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

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 3:55 pm
by Daria MacAuslan 1H
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.

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 3:57 pm
by Sally Qiu 2E
R is a gas constant and the numerical value depends on the units being used to measure the gas

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 4:06 pm
by Hannah Pham
R is the Ideal Gas Constant which has the value of 8.314J/molK.

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 4:15 pm
by Angela Prince 1J
R is the ideal gas constant, which will probably be given to us on a test/exam.

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 4:25 pm
by Kylie Lim 4G
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

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 5:36 pm
by Edmund Zhi 2B
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

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 10:44 pm
by Anthony Hatashita 4H
It's a constant and should be given with any exams so I don't think we need to worry too much about it.

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 10:51 pm
by kausalya_1k
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.

Re: R in PV=nRT

Posted: Fri Jan 10, 2020 11:51 pm
by faithkim1L
R is the gas constant. I believe it will be given on the equation/constant sheet on tests.

Re: R in PV=nRT

Posted: Sat Jan 11, 2020 1:00 pm
by lauraxie2e
it is the gas constant and can either be seen as 8.314 J/mol·K or 0.082057 L⋅atm/mol⋅K

Re: R in PV=nRT

Posted: Sat Jan 11, 2020 3:01 pm
by Donavin Collins 1F
R is a gas constant and should be given to you on the formula sheet for tests.

Re: R in PV=nRT

Posted: Sat Jan 11, 2020 3:10 pm
by Jesse Anderson-Ramirez 3I
R is the gas constant with a value of 8.314 (J)/((Mol)(K))

Re: R in PV=nRT

Posted: Sat Jan 11, 2020 3:56 pm
by Andres Merlos 2L
R refers to the gas constant which depends on the units you are using for your equation.

Re: R in PV=nRT

Posted: Sat Jan 11, 2020 4:39 pm
by Kayla Maldonado 1C
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 Kp?

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 1:49 pm
by Rosa Munoz 2E
The R is a constant, you can find it on the equation sheet. Just pay attention to which unit of pressure they are using.

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 2:54 pm
by JohannaPerezH2F
R is the gas constant and it equals 8.314 J / mol·K.

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 2:59 pm
by Matthew Chan 1B
R just represents the gas constant, which is 8.314 J.mol-1.K-1

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 3:52 pm
by Alfred Barrion 2H
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

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 4:38 pm
by Emil Velasco 1H
R is the gas constant, should be found on the equations sheet

Re: R in PV=nRT

Posted: Sun Jan 12, 2020 4:43 pm
by Andrea_Torres
The R in PV=nRT stands for the gas constant and its units are 8.314 J/mol·K.