## Gas Constant, R

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

torialmquist1F
Posts: 49
Joined: Sat Jul 22, 2017 3:00 am

### Gas Constant, R

Will we ever need to use one of the other gas constants given on the constants/equations sheet for the midterm or only the 8.314 one?

Nishma Chakraborty 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: Gas Constant, R

I don't know for sure, but I've used 8.314 J/(molK) for the most part this quarter. However, some practice problems have used the 0.08206 (L*atm)/(molK), so honestly I'd check to see if my units cancel just to be safe. Hope this helps!

Nickolas Manipud 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:07 am

### Re: Gas Constant, R

Some problems from the homework required using 8.206 x 10^-2

Justin Chang 2K
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

### Re: Gas Constant, R

I agree, always make sure that you check your units of everything else before deciding what value of R to use.

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

### Re: Gas Constant, R

These values are all equivalent, they are just in different units. Depending on the units of the given information, these other values can be very helpful.

LMendoza 2I
Posts: 41
Joined: Sat Jul 22, 2017 3:00 am

### Re: Gas Constant, R

It depends on the formula you use and the units within the formula you use and values you are given.

AtreyiMitra2L
Posts: 169
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

### Re: Gas Constant, R

We often use 0.0821 when calulating with PV = nrT. For the others, it is possible I suppose.