Gas Constant (R)

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Sarah Zhari 1D
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

Gas Constant (R)

Postby Sarah Zhari 1D » Tue Jan 21, 2020 1:13 pm

On the constants sheet, there are multiple values for the gas constant (R). When would we use each of these values? Specifically, how do we know when to use 8.314 and not 8.314x10^-2?

Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

Re: Gas Constant (R)

Postby Brian Tangsombatvisit 1C » Tue Jan 21, 2020 1:17 pm

You would choose the gas constant to use based on what unit what you want to convert your concentration value into. Generally, you would use R when solving for P given the concentration using P = (n/V)RT. If you wanted your partial pressure to be in units of atmospheres, then you would use the gas constant R that has atm in its units. If you want units of Bar, use the constant with Bar and so forth.

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

Re: Gas Constant (R)

Postby BCaballero_4F » Tue Jan 21, 2020 4:13 pm

Which one you would use depends on the units you are initially given in the problem

Amir Bayat
Posts: 115
Joined: Sat Sep 07, 2019 12:16 am

Re: Gas Constant (R)

Postby Amir Bayat » Tue Jan 21, 2020 4:16 pm

The gas constants are different because they are in different units. When given gas constants, typically utilize the one in which you have the units for.


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