Ideal Gas Law? Finding the constant?

Question

How do I know what the constant is to do the Ideal Gas Law? 

My homework problem says:

A sample of 1.00 moles of oxygen at 50(degrees) C and 98.6 kPa occupies what volume?

So far I have the equation:
   98.6V=1(R)323
I need to find the constant so I can find the volume? Am I making any sense? How do I find the constant. (Please don't give me the answer.)

Dan A · Accepted Answer

The constant depends on what units you are using. 

I will point you to this page:

http://en.wikipedia.org/wiki/Gas_constant

See on the right hand side? It lists the value for R for a whole heap of unit systems. Since you are using kPa for pressure, if you use R = 8.314, you will get volume in litres.

Because it is not very convenient to memorize a whole heap of values, i find it easiest to just remember 8.314 J/(mol K) which will for for EITHER of the following unit systems:

V in Litres
P in kPa
T in K
or

V in m^3
P in Pa
T in K

pisgahchemist · Answer

R can have a variety of values, and the most common value is 0.0821 Latm/molK.

Also expressed as...
8.314 LkPa/molK or 8.314 J/molK
and
62.4 Ltorr/molK

PV = nRT
R = PV / nT

? · Answer

you're off by utilising some orders of magnitude. it is going to be: 25 * two hundred (do no longer forget to transform bar to kilopascals) = m/M * 8.314 * (sixty 5 + 273) i did no longer verify in case you probably did the mass conversion wisely.

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Ideal Gas Law? Finding the constant?

3 Answers