R (constant 8.314 or 8.206)


and

Moderators: Chem_Mod, Chem_Admin

Quynh Nguyen 2O
Posts: 27
Joined: Fri Sep 26, 2014 2:02 pm

R (constant 8.314 or 8.206)

Postby Quynh Nguyen 2O » Wed Feb 04, 2015 2:25 pm

How do we know when to use R= 8.314 or R = 8.206?

Chem_Mod
Posts: 18921
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 745 times

Re: R (constant 8.314 or 8.206)

Postby Chem_Mod » Wed Feb 04, 2015 3:48 pm

You need to look at the units and see which one matches the rest of the units in the calculation. The units for the following are...
8.314 J/mol.K
8.206 L.atm/mol.K

martha-1I
Posts: 76
Joined: Fri Sep 26, 2014 2:02 pm

Re: R (constant 8.314 or 8.206)

Postby martha-1I » Wed Feb 04, 2015 9:38 pm

8.206L.atm/mol.k will usually be used when using the equation PV=NRT because the units will cancel out nicely since pressure will be in atm, volume will be in L, n=mol, and T will be in kelvin.

Chem_Mod
Posts: 18921
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 745 times

Re: R (constant 8.314 or 8.206)

Postby Chem_Mod » Wed Feb 04, 2015 10:40 pm

Clarification: R = 0.08206 Latm/molK, not 8.206


Return to “Calculating Work of Expansion”

Who is online

Users browsing this forum: No registered users and 1 guest