00:01
Question number 111 wants you to predict which compound has a greater delta h of combustion.
00:12
To do this, you need to write the combustion reactions for methane and for methanol vapor.
00:20
And after writing the chemical reactions, balance them in order to see which one might be producing more product.
00:29
So let's do that first.
00:30
We have methane reacting with oxygen to produce in a combustion reaction carbon dioxide and water.
00:38
We then have methanol vapor or formaldehyde vapor reacting with oxygen to produce carbon dioxide and water.
00:45
When we do that, we see that once we have balanced them, we produce two moles of water here and just one mole of water here.
00:54
Because oxygen has a delta h of formation of zero, then the difference in the number of oxygen moles is not going to affect the delta h of combustion.
01:08
So assuming that these delta hs of formation are very close to each other, then the one that is going to produce more product is going to also produce more heat...