00:01
Okay, so in this problem we're talking about retinol and specifically the amount of energy we need to break certain bonds in retinol, specifically the pi carbon carbon double bond.
00:13
All right, so the piece of information gives us is that the bond dissociation energy is equal to 200, sorry about that, is equal to 250 kilojoules per mole.
00:31
Okay, so now the first thing we're going to do is figure out how much energy.
00:34
We need to break a single bond, not the molar quantity.
00:39
In order what to do is we're going to call that energy, and we're basically going to have this 250, and we're going to multiply that by 1 ,000, and what that's going to do is not 100 ,000.
00:51
What that's going to do is give us this in terms of joules and not kilojoules.
00:56
To deal with the moles, what we're going to do is divide this by avagadro's number, which is 6 .02 times 10 of the 23rd, and that's going to give us just joules as our unit.
01:08
So if we do that calculation, the value we come up with is 4 .15 times 10 to the negative 19 joules.
01:22
So really not much energy is required to break that bond at all.
01:26
Okay.
01:27
So now we get to delve a little bit into the world of quantum, which is not something you get to do very much when you're doing organic chemistry.
01:34
And we can say that the energy is equal to plank's constant h times the frequency...