Constant


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Jina Kwon
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

Constant

Postby Jina Kwon » Sat Feb 15, 2020 12:53 pm

What R constant do we use fort this equation?

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: Constant

Postby Tyler Angtuaco 1G » Sat Feb 15, 2020 1:09 pm

I would guess the 8.314 J·K-1·mol-1 since enthalpy is in joules and temperature is in kelvin. The units would then cancel, which makes sense because the equilibrium constant has no units.

Caitlyn Tran 2E
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

Re: Constant

Postby Caitlyn Tran 2E » Sat Feb 15, 2020 2:08 pm

The R constant depends on the units you are given and/or the units you want to end up with. For instance, if you are given volume in liters and pressure in atm, then use the constant with those units in it (8.206x10^-2). If you are calculating entropy, use the 8.314 R constant since you want entropy to be in J/K. Hope this helps!

Daria Azizad 1K
Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

Re: Constant

Postby Daria Azizad 1K » Sat Feb 15, 2020 9:42 pm

A good way to figure out which R to use it to see what units you need to cancel in order to get the desired units


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