00:01
In this video, we're going to be figuring out the standard heat of this reaction.
00:05
Basically, the change in enthalpy.
00:08
So we're given this reaction, and we're also told what the delta h of formation is for two of the substances.
00:14
I'm going to draw a dividing line, separating reactants and products, and then we'll label this as delta h of formation.
00:22
Now, two substances were not given, and that is the zinc and the copper, the solid zinc and the copper.
00:28
But because those are elements, they're in their elemental state, the delta h of formation of those elements is zero, because of course it doesn't take any energy change to go from the element to itself.
00:44
So that is, of course, no change.
00:47
That's just going to be delta h of formation of zero.
00:50
So we're left with just the zinc with a positive two and the copper with a positive two.
00:55
Now, as we're doing the delta h of the reaction, it's going to be the sum of the products minus the sum of the delta h formation of the reactants.
01:09
Sometimes you'll see this symbol that just shows the summation, and sometimes you'll see the delta h zero symbol as well, but we just remember that it's the products minus the reactants...