R Constant


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805383532
Posts: 53
Joined: Thu Jul 11, 2019 12:16 am

R Constant

Postby 805383532 » Sun Jan 19, 2020 11:24 am

How do we know which R constant to use in calculation?

Kimberly Koo 2I
Posts: 99
Joined: Sat Aug 17, 2019 12:17 am

Re: R Constant

Postby Kimberly Koo 2I » Sun Jan 19, 2020 11:53 am

R is the universal gas constant, which is 0.082 L.atm/mol.K

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: R Constant

Postby 805097738 » Sun Jan 19, 2020 12:16 pm

Kimberly Koo 2I wrote:R is the universal gas constant, which is 0.082 L.atm/mol.K


there are different R constants for different units though

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Re: R Constant

Postby Robert Tran 1B » Sun Jan 19, 2020 12:55 pm

You should use the R constant that has units that cancel out with the other units in the equation. For example, in PV=nRT, we use 0.08206 (L*atm)/(mol*K) because it cancels with the pressure, volume, moles, and temperature.

Jared Khoo 1G
Posts: 107
Joined: Wed Sep 18, 2019 12:16 am

Re: R Constant

Postby Jared Khoo 1G » Sun Jan 19, 2020 1:21 pm

Use the R constant that uses the appropriate unit of pressure.

105335337
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: R Constant

Postby 105335337 » Sun Jan 19, 2020 1:55 pm

R is the universal gas constant and has the units of the other variables (L, atm, etc...)

Veronica Lu 2H
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Joined: Wed Sep 18, 2019 12:18 am
Been upvoted: 1 time

Re: R Constant

Postby Veronica Lu 2H » Sun Jan 19, 2020 6:29 pm

R is usually 0.082- it may also be on the formula sheet

Trent Yamamoto 2J
Posts: 111
Joined: Sat Aug 17, 2019 12:18 am

Re: R Constant

Postby Trent Yamamoto 2J » Sun Jan 19, 2020 9:31 pm

The R values are different depending on the temperature used in the reaction


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