00:03
So in this question, we have 500 grams of co2.
00:06
It starts out as a solid and it becomes a gas.
00:10
It really isn't relevant that it starts out as a solid in our case because 500 grams is 500 grams.
00:17
That's conservation of mass.
00:20
But it's going to occupy a space of 0 .80 liters at a temperature of 700 kelvin.
00:28
And the question is, what pressure is that going, to be.
00:35
And so what i'm going to do first, we ultimately want to get this to a position where we can use the ideal gas law.
00:42
So pv equals nrt.
00:47
We want to solve for pressure.
00:49
So we're going to rearrange by dividing both sides by volume.
00:55
And we have our temperature and we have our volume and we have our volume and we have r because it's a constant.
00:59
But we need our number of moles.
01:02
We have grams.
01:03
So we're going to need to use some stoichiometry to convert that to moles.
01:07
So let's start there.
01:08
So we've got our 500 grams of co2.
01:17
And for every one mole of co2, the molar mass of co2 is 44...