Ideal gas constant R


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Maayan Epstein 14B
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Joined: Fri Sep 28, 2018 12:20 am

Ideal gas constant R

Postby Maayan Epstein 14B » Mon Feb 04, 2019 5:02 pm

When do I plug in the ideal gas constant, R, as 0.0825, and when do I plug it in as 8.314?
Not sure when to use which!

Charles Hood Disc 1C
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Joined: Fri Sep 28, 2018 12:19 am

Re: Ideal gas constant R

Postby Charles Hood Disc 1C » Mon Feb 04, 2019 6:06 pm

Look at the units you are dealing with, the constants have different units. So if you don't know try looking at what units you are using and comparing them to the units of the gas constants.

Heesu_Kim_1F
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Re: Ideal gas constant R

Postby Heesu_Kim_1F » Mon Feb 04, 2019 10:49 pm

I think it just depends on which units you are working with: R = 0.08206 L x atm x K^-1 x mol ^-1 and R = 8.314 J x K^-1 x mol^-1.

Jake Gordon 1A
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Re: Ideal gas constant R

Postby Jake Gordon 1A » Tue Feb 05, 2019 11:08 am

The units for the small constant given above are atm L per mol K and the other constant is J per mol K, since the mol K in the denominator is consistent, it depends on whether you are using pressure and volume( atm and L) or energy (J or kJ) in the overall mathematic expression.

Maayan Epstein 14B
Posts: 39
Joined: Fri Sep 28, 2018 12:20 am

Re: Ideal gas constant R

Postby Maayan Epstein 14B » Tue Feb 05, 2019 6:32 pm

Thank you for the responses!

Tony Chung 2I
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Re: Ideal gas constant R

Postby Tony Chung 2I » Wed Feb 06, 2019 11:28 pm

That depends on the units that you are given and are working with.

Carine Tamamian 2B
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Re: Ideal gas constant R

Postby Carine Tamamian 2B » Thu Feb 07, 2019 11:54 am

Depends on the units! L or J

jocelyntzeng
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Re: Ideal gas constant R

Postby jocelyntzeng » Sat Mar 16, 2019 1:03 pm

just look at the units and see which one to use

Mark 1D
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Re: Ideal gas constant R

Postby Mark 1D » Sat Mar 16, 2019 6:56 pm

depends on the units in the question

Jacqueline Duong 1H
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Re: Ideal gas constant R

Postby Jacqueline Duong 1H » Sat Mar 16, 2019 7:40 pm

Yeah, it depends on the question and what units you would need to be able to cancel out

Callum Guo 1H
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Re: Ideal gas constant R

Postby Callum Guo 1H » Wed Jan 08, 2020 10:25 pm

It depends if the pressure given is in atm or pascals


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