00:02
There, this question is asking about boiling point.
00:10
And boiling point is the temperature of a substance at which the vapor pressure above the liquid equals the atmospheric pressure.
00:39
Okay, so that is the boiling point.
00:41
This question is asking about the normal boiling point.
00:46
The normal boiling point is defined as the temperature it boils at standard pressure.
01:13
All right, so we've defined what normal boiling point is.
01:17
It's still going to be the temperature at which the vapor pressure equals the atmospheric pressure but the atmospheric pressure is going to be standard pressure.
01:29
So this will give us a normal boiling point.
01:32
So let's look at letter a.
01:34
Letter a says the temperature at which the vapor pressure equals 760 torr.
01:39
Well, we have to think about some of the values for standard pressure.
01:42
Standard pressure is one atmosphere.
01:45
It's 760 millimeters of mercury.
01:48
It's also 760 torr.
01:51
It's 101 .3 kilopascals.
01:56
And we could go on and on...