R value in equation

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Mia Navarro 1D
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

R value in equation

Postby Mia Navarro 1D » Wed Jan 17, 2018 9:45 am

How do you know which value of the constant R to use for different equations?
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Kailey Brodeur 1J
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Joined: Thu Jul 27, 2017 3:00 am

Re: R value in equation

Postby Kailey Brodeur 1J » Wed Jan 17, 2018 9:48 am

You have to use the R value with the corresponding units to the other variables you are using. Just make sure the right units are canceling out.
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Justin Chu 1G
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Re: R value in equation

Postby Justin Chu 1G » Wed Jan 17, 2018 10:23 am

I think generally the R we use more often will contain the units L.atm/mol.K
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Meredith Steinberg 2E
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Re: R value in equation

Postby Meredith Steinberg 2E » Wed Jan 17, 2018 11:08 am

The R value depends on the units you're working with
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Joshua Xian 1D
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Re: R value in equation

Postby Joshua Xian 1D » Wed Jan 17, 2018 1:02 pm

Usually when solving for something involving joules/work/energy, you would use 8.314 J/mol•K. If it involves pressure (or if you need to use PV=nRT), you would use the other R constants with pressure units.
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