R  [ENDORSED]


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Maria Trujillo 1L
Posts: 47
Joined: Fri Apr 06, 2018 11:05 am

R

Postby Maria Trujillo 1L » Sun Jan 13, 2019 8:33 pm

Hello, I am confused by what units we are to use when using the Pv=nRT equation, specifically in regards to R. There are various units you can have it in. However, it is unclear to me which ones are the correct ones when regarding to concentration.

lizettelopez1F
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

Re: R

Postby lizettelopez1F » Sun Jan 13, 2019 8:50 pm

Pressure= atm
V=liters
T=Kelvin
R= .0821 (liters x atm)/(moles x kelvin)
Pressure is usually given in atm, so the units of R would be the unit mentioned above. However, if pressure is given in another unit, the unit of R also changes to correspond to the unit of pressure that is given.

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

Re: R

Postby Nandhini_2K » Sun Jan 13, 2019 9:55 pm

R = 0.0821 atm x L / mol x K

Elle_Mendelson_2K
Posts: 72
Joined: Fri Sep 28, 2018 12:28 am

Re: R

Postby Elle_Mendelson_2K » Sun Jan 13, 2019 10:02 pm

(P)ressure is in atm (atmospheric)
(N) is moles
(V) is liters
(T) is kelvins
(R) is a constant ".0821" liters x atm/moles x kelvin

Angel Chen 2k
Posts: 59
Joined: Fri Sep 28, 2018 12:20 am

Re: R

Postby Angel Chen 2k » Mon Jan 14, 2019 12:20 am

From my perspective, I do not think that you need to know much about the definition of R or memorize the value of R. They will be given in the tests. However, one thing you need to know is how to apply different values and units under different circumstances. It all depends on the settings of the questions.

Hope this helps!

705170809
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

Re: R  [ENDORSED]

Postby 705170809 » Mon Jan 14, 2019 3:11 pm

I also asked my TA about this question, and he said that R is a constant, so we should not have to worry about remembering it like how we are given constants on the constant wkst.


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