00:01
Again, to calculate the molar mass of the gas, we'll use a modified form of the ideal gas law.
00:06
This modified form allows us to calculate the density of the gas from the molar mass.
00:12
Density is equal to molar mass, multiplied by the pressure in atm, divided by r, divided by the kelvin temperature.
00:20
If we rearrange this, then molar mass is simply equal to the density of the gas, which will be in units of grams per liter, multiplied by r and the kelvin temperature divided by the pressure in atm.
00:37
So we'll start by calculating the density.
00:40
We have 38 .8 milligrams of the gas.
00:43
If we divide that by 1 ,000, that will give us grams of the gas...