00:01
Here we're going to calculate the normal boiling point of ethanol.
00:04
When thinking about the boiling point, we have a couple different components.
00:08
We have our free energy at our boiling point, our standard free energy.
00:14
We have our enthalpy, standard at our boiling point, and we have our enthalpy at our boiling point.
00:22
At phase changes, the standard change in free energy will always be zero at a phase change.
00:29
So at a boiling point, we're at a phase change, so we know that our standard free energy at the boiling point is going to be zero kilojoules.
00:37
This will become very important later.
00:40
We are given that our standard entropy of vaporization is 110 joules per mole kelvin, and that our enthalpy of vaporization is 38 .6 kilojoules per mole.
00:59
So now that we have these three values, we can use our equation here, where we have our equation here, have our delta g standard is equal to our delta h standard minus t delta s standard.
01:11
So since we're solving for our boiling point, we will be solving for temperature.
01:16
So let's go ahead and do some algebra here.
01:18
We have that our delta g standard minus our delta h standard divided by t is equal to, oh, excuse me, divided by our standard entropy is going to be equal to t to negative t...
