00:01
Okay, so we're going to be looking at the solubility of gases and solution, and that tends to refer us to henry's law.
00:08
The concentration of a gas equals a constant times a partial pressure of that gas above the solution.
00:15
Okay.
00:17
So for part a, we know we've got a k.
00:19
So that's 3 .8 times 10 and negative 4.
00:24
And the units are molarity per atm.
00:29
And they just want us to change them to molarity per millimeters of mercury.
00:34
So i'll put 8tm up here, so they cross out, and millimeters of mercury down here, and one atmosphere is 760 millimeters of mercury.
00:45
So this is going to be 5 .0 times 10 of the negative 7 molar per milligram of mercury.
00:55
So we can now use that in our next part.
01:03
Okay, the concentration of the gas is k, which we just found, times 10 to negative 7 molar for millimeters.
01:16
So as long as we have our pressure in millimeters of mercury, we can just multiply.
01:19
So 2 .93 millimeters of mercury.
01:24
Those cross out...