Gas constant

$PV=nRT$

Andrea_Torres
Posts: 98
Joined: Sun Sep 15, 2019 12:15 am

Gas constant

I know that in PV=nRT there is a gas constant but how do you determine which one is suitable for the problem?

peteryim
Posts: 54
Joined: Sat Sep 07, 2019 12:17 am

Re: Gas constant

It depends on the units of the other measurements given.

Brianna Becerra 1B
Posts: 117
Joined: Fri Aug 02, 2019 12:16 am

Re: Gas constant

You pay attention to the units you have already and want to cancel out to get the units desired for the type of problem. The different gas constants have different units and are on the constants and equations sheet.

Jesalynne 2F
Posts: 100
Joined: Wed Sep 18, 2019 12:18 am

Re: Gas constant

You will want to use the constant that has the units that apply to the problem you are solving; you will want the units to cancel to give you the unit you want your answer to be in.

Posts: 53
Joined: Fri Aug 02, 2019 12:16 am

Re: Gas constant

Yep, it is based on the units.
R = 8.314 J/(mol * K)
R = 0.08206 (atm*L)/(mol*K)

Timmy Nguyen Dis 1I
Posts: 107
Joined: Sat Aug 17, 2019 12:17 am

Re: Gas constant

Look at the other units and use the one that matches.

Timmy Nguyen Dis 1I
Posts: 107
Joined: Sat Aug 17, 2019 12:17 am

Re: Gas constant

Look at the other units and use the one that matches.

Sean Tran 2K
Posts: 65
Joined: Sat Aug 17, 2019 12:17 am

Re: Gas constant

The value used is dependent on the units given.

Emil Velasco 1H
Posts: 96
Joined: Wed Nov 21, 2018 12:19 am

Re: Gas constant

Choosing which R to use depends on what units you are trying to cancel out in order to solve for your specific answer.

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

Re: Gas constant

There are several gas constant to choose from but you should always choose the one that allows you to have all the units cancel. Ensure that you do not introduce new units with your gas constant

AGaeta_2C
Posts: 112
Joined: Wed Sep 18, 2019 12:21 am

Re: Gas constant

It is crucial that you choose the version of the gas constant that has the same units as the problem you're working on, just so they cancel out and you don't introduce new units.