00:01
Okay, we are asked to consider the following chemical equation.
00:25
And we're asked to find the heat of reaction, the change in entropy, and gibbs free energy.
00:50
Okay, so first let's find our delta g.
00:55
We have a bunch of givens, so i'm just going to write that these were all provided.
01:05
So our delta g will equal my product, which is h2o.
01:16
H2o g is negative 242 kilojoules per mole, plus 2 times so2, negative 297 kilojoules per mole.
01:44
We're going to subtract from those.
01:46
2 times h2s is negative 21 kilojoules per mole, plus 3 times 0.
02:02
And let me say our givens were provided and that are those numbers right there.
02:08
Those were all provided.
02:12
And just quickly, this one is 12g and h2s.
02:30
Now let me get going on this one and put these numbers in my calculator.
02:34
Clear, clear.
02:35
2 times negative 242, enter, plus parentheses, 2 times negative 297, close, enter.
02:47
I'm going to subtract from that parentheses, 2 times negative 21, close, enter.
02:54
And i get negative 1036 kilojoules.
03:01
Why am i writing delta g there when that's s, h.
03:15
Now let's do delta s.
03:18
Same general format, these are all provided.
03:27
Two times 189, and this is joules per mole k, plus 2 times 248, minus 2 times 206, plus 3 times 205.
04:18
And then that's going to have a big thing there.
04:21
Sort of ran out of room there, but i guess i can slide over a bit.
04:26
So i've got 2 times 189, enter, plus parentheses, 2 times 248, close, enter.
04:38
I'm going to minus 2 times 206, then i'll minus 3 times 205.
04:52
And i get my change in entropy equal to negative 153 joules per k.
05:14
Okay.
05:15
So there's that answer.
05:18
There's my first two answers.
05:23
And my delta h, or delta g, will equal my delta, this number.
06:01
So that's 2, 4 times that is 1 ,000.
06:06
Yeah.
06:08
So i don't know why all these questions for me, but minus 298 times 0 .153 kilojoules per k.
06:24
Let me do this.
06:28
Negative 1036 minus parentheses 298 times negative 0 .153, close, enter.
06:37
And this will be negative 990 kilojoules...