Units


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Toru Fiberesima 1L
Posts: 63
Joined: Fri Apr 06, 2018 11:02 am

Units

Postby Toru Fiberesima 1L » Wed Jan 09, 2019 9:58 am

What are the units for P=(nRT)/V? And what is the ideal gas constant?

Sarah Kiamanesh 1D
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

Re: Units

Postby Sarah Kiamanesh 1D » Wed Jan 09, 2019 10:20 am

For the Ideal Gas Law:
P (pressure) is measured in pascals
V (volume) is measured in cubic meters
n is the number of moles
T (temperature) is measured in kelvins
R (the constant) has value 8.314 J/(K. mol)

Venya Vaddi 1L
Posts: 96
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

Re: Units

Postby Venya Vaddi 1L » Wed Jan 09, 2019 2:30 pm

You can also use the units:

P in atmospheres (atm)
V in liters (L)
n in moles
T in Kelvin (K)
R= 0.08206 L.atm.K-1.mol-1 (constant)

ian_haliburton_1f
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

Re: Units

Postby ian_haliburton_1f » Wed Jan 09, 2019 3:47 pm

I believe you can also use other units for pressure (such as atm or Torr) as long as you adjust the value and units of the constant R accordingly? There is a table for values of R based on which units are used.

chaggard
Posts: 37
Joined: Fri Sep 28, 2018 12:19 am

Re: Units

Postby chaggard » Wed Jan 09, 2019 3:56 pm

Correct, however the most commonly used form of these types of questions deal with those specific units. Just always remember to make sure all units cancel!

805087225
Posts: 30
Joined: Thu Jun 07, 2018 3:00 am

Re: Units

Postby 805087225 » Thu Jan 10, 2019 12:25 pm

In most questions, pressure is usually in atm, so use an appropriate R and make all units cancel out!


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