00:04
In this question, we have a mixture of 235 milligrams of helium and 325 milligrams of neon with a total pressure of 453 tor and we're asked to find the partial pressure of helium in this mixture.
00:19
So the total pressure, according to dalton's law here, will be the partial pressure of helium and the partial pressure of neon, the sum of those two.
00:31
And these are how much of the total pressure comes from each one depends on the mass percent of that component in the mixture.
00:44
So what we're going to do is find the percentage of the mixture that comes from helium and then we will use that and the total pressure to calculate the partial pressure from helium.
00:56
So to do that, we're going to put both of these into moles and then use those numbers to find the percentages of each component.
01:10
So for helium, we have 235 milligrams of helium.
01:18
One gram contains 1 ,000 milligrams.
01:24
And then helium's molar mass is 4 grams per mole.
01:31
So one mole over 4 grams will give us moles.
01:36
So milligrams helium cancel and grams cancel.
01:40
We're left over with 0 .5 or sorry 0 .059 moles of helium.
01:49
So there is that.
01:51
And then let's do the same thing with neon...