00:02
Hello there.
00:03
In this problem, we are trying to determine the molar mass of an unknown gas when we are given mass, temperature, pressure, and volume.
00:14
So the equation from the unit that i'm going to need is the one that says molar mass is equal to mass times the universal gas constant times temperature divided by pressure times volume.
00:31
All right, let's start plugging values from the problem into this equation.
00:38
First of all, the mass.
00:39
We are given 33 .5 grams.
00:49
For r, i want to select an r that corresponds to the units found in the pressure.
00:54
The pressure in this problem is in atmospheres.
00:58
So i am going to select the universal gas constant that has the units atmospheres.
01:05
So that's the 0 .0821 liters times atmospheres all over mole times.
01:14
Kelvin.
01:17
For temperature, in the problem, i am given 13 degrees celsius.
01:23
We know that in any gas law problem, we have to use kelvin for the equation to work properly...