00:02
Hi there.
00:03
This problem is located in the ideal gas equation section.
00:09
So to solve this problem, we will be using the ideal gas law, which is pv equals nrt.
00:22
In this problem, we are given several values as we read through the problem, but we see that what we're trying to find is the number of moles.
00:33
So we're trying to figure out how many moles of xenon gas we have.
00:42
Reading on through the problem, we see that we're given a pressure of 1 .18 atmospheres.
00:51
We are given a temperature of 18 degrees celsius.
00:59
However, we know whenever we're using the ideal gas law equation, temperature must be absolute temperature.
01:06
It must be in kelvin.
01:09
So we're going to add 273 to this.
01:12
Which gives us 291 kelvin.
01:16
And we're also given a volume of 26 .7 liters.
01:24
So right now we have four out of the five variables in this equation.
01:30
We are missing r.
01:32
R is the universal gas constant.
01:34
We have a couple of values for r that were given to us in this unit.
01:39
We want to select the one that matches up in terms of units.
01:44
So since our pressure is in atmospheres, i'm going to select the r value that has atmospheres in its unit.
01:51
So that is 0 .821 liters times atmospheres over mole kelvin.
02:05
It has some rather odd units there, but we will see what happens with those units here in a few moments...
