## Units

$PV=nRT$

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

### Units

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

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

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

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

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

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

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