00:01
So this particular question, which gives us water, vapor pressure of water and an amount of water enclosed in a container, and they want to know if any liquid is present and how much liquid is present.
00:11
What we're going to need to find out is how much water vapor is present in this container.
00:18
And what most people don't realize is that we can use the vapor pressure along with pivner to find out the moles of water.
00:34
Present.
00:35
And if we can find the moles of water present as the water vapor, we can then convert that to grams, to molecules, anything.
00:46
So we're going to take the vapor pressure of the water along with the volume of the container.
00:51
We're going to assume that that 1 .25 grams of water that's in there is really negligibly changing the volume of the container.
00:59
The r value, because our pressure is in tor, is the 62 .36.
01:04
I wrote that wrong liter, tor per kelvin mole, and our temperature, which they gave us was 25 degrees celsius, which is 298 kelvin's...