00:01
To solve this problem, we're going to want to use the ideal gas law, pv equals nrt.
00:06
Our pressure is given as 1 .05 atmospheres.
00:12
Our volume is unknown.
00:15
We can find our number of moles since we have 12 .5 grams of argon, which has a molar mass of 39 .948 grams per mole.
00:28
So we divide by its molar mass, and the grams will cancel.
00:32
And we'll end up with our final answer in moles, which is what we need for n.
00:36
That's 0 .1329 moles.
00:42
Our r value in this case is going to be 0 .082 -057.
00:53
And the units for that are liter atmospheres per mole kelvin.
00:59
And so there are several different values for r, but the only difference is the units.
01:04
And since we have, we're looking for volume and liters, we have atmospheres, we have moles, and our temperature will be in kelvin, we want to use this value for r...