00:01
Okay, so here we want to do the density of krypton gas, and we know the pressure is 1 .35 atmospheres, and the temperature is 54 .1 degrees celsius.
00:11
So, typically, we could use pv equals nrt, but here we're asked for the density, and density is mass over volume.
00:20
And so what we have here is moles over volume, if we wanted to equate it to the best we can with this equation.
00:31
So we have moles and volume.
00:34
But there is a way that we can get density within our equation.
00:39
So if we think about how we calculate something like moles, moles we can get from taking the mass, which is in units of grams, and multiplying it by the molar mass.
01:00
And so when we do this, grams cancel out and we're left with moles...