subtracting a negative number so we're going to be adding a little bit back.

Changes it slightly and usually the work term is much smaller than the heat

portion and we see that case here, it's almost the same as the delta H, but

it did bring it up, ever so slightly, to a little less negative value of 1254.3,

now this, this quantity is for the equation as balanced.

But they didn't ask for in the amount as balanced they want to know it

when you react this amount of acetylene.

So, let's start with the 15.5 grams of acetylene C2 H2.

Well this relationship here is for the balanced equation so

if we incorporate what we know about C2 H2 it is 1254.3

kilojoules for every one mole of C2 H2 that reacts.

So I know that this is the relationship from my thermochemical equation.