2 different R constants?

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Madeline Fox 2B
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

2 different R constants?

Postby Madeline Fox 2B » Tue Jan 17, 2017 11:54 am

Can someone explain to me why there are two different R constants? One that is .0821 & the other that is 8.3145. I'm very confused on how you know when to use each one when there is an R in the equation

emilie liu 3G
Posts: 23
Joined: Fri Jul 22, 2016 3:00 am

Re: 2 different R constants?

Postby emilie liu 3G » Tue Jan 17, 2017 1:09 pm

You can determine which R constant to use in the problem depending on the units of the problem. The units of R should match the units in your problem.

Amy_Shao_2D
Posts: 22
Joined: Fri Jul 15, 2016 3:00 am

Re: 2 different R constants?

Postby Amy_Shao_2D » Thu Jan 19, 2017 10:29 am

.0821 has units L*atm/(K*mol) ad 8.314 has units J/(K*mol) so depending on what the problem is asking and what units are used in the problem, you can determine which R to use


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