00:01
The reaction for which we'll be estimating delta h or the change in energy will be one mole of nitrogen, which is triple bonded, with three moles of hydrogen, each hydrogen singly bonded to each other, producing two moles of ammonia with three nh bonds.
00:27
So if they tell us that the energy associated with an n and a triple bond is 946, then the energy required to break a mole is going to be 946 kilojoules per mole.
00:48
Then we also need to break three moles of h -h bonds.
00:52
So the energy for that process is going to be three times the energy required to break a mole of h -h bonds.
01:02
Which they've given to us as 432, and we get 1 ,296.
01:13
Then we need to make 6 n -h bonds.
01:21
And this might be where you were a little confused, because one, they've given us an n double bond h, when it's really an n single bond h.
01:30
And they want just one mole of methane, which will be three, sorry, one mole of ammonia, which would be three nh single bonds.
01:43
But truthfully, if you're going to break one mole of this and three moles of this, you're going to make two moles of ammonia, not just one mole...