Page 1 of 1

Conversion of R

Posted: Fri Mar 16, 2018 2:15 pm
by Naana Boateng 1I
When using the Pv=nRt formula, do you represent R as 8.314 or 8.206 x10^-2?

Re: Conversion of R

Posted: Fri Mar 16, 2018 2:39 pm
by Jessica Jones 2B
This would depends on the units you are trying to cancel. If pressure were in atm you would use .0826 so that the units would cancel

Re: Conversion of R

Posted: Fri Mar 16, 2018 3:04 pm
by Naana Boateng 1I
what if pressure was not given to you? Would you use 8.314?

Re: Conversion of R

Posted: Fri Mar 16, 2018 3:48 pm
by Ivy Lu 1C
It still depends on what you're solving for. If you're not given pressure and solving for pressure, then you would use 8.206 x 10-2 L·atm·K-1·mol-1, because that would cancel out so that you get atmospheres for the units of pressure. If you're not given pressure and trying to solve for work, then you use 8.314 J·K-1·mol-1 because that would cancel out so that you get Joules for your units of work.

Re: Conversion of R

Posted: Fri Mar 16, 2018 5:21 pm
by Angel R Morales Dis1G
You would have to see what units you are using or solving for. If you are trying to find joules, you will be using 8.314

Re: Conversion of R

Posted: Fri Mar 16, 2018 6:21 pm
by Rachel Wang
I've found that I generally use 8.314J/mol.K because it cancels out n (mol) and T(K).

Re: Conversion of R

Posted: Sun Mar 18, 2018 4:05 am
by AlyssaPeckham1A
Check the units behind the constant R to see what needs to cancel out in the problem you are solving.

Re: Conversion of R

Posted: Sun Mar 18, 2018 5:22 pm
by Phillip Tran
youll use 8.314 most of the time but whenver the units are L.atm then you use 8.206