So if we multiply all that information out,

what we would obtain is that this is equal to a negative 35,981

joules or to three significant figures which is all we can really know this.

To three significant figures, that would be a negative 300 or

sorry negative 36.0 kilojoules.

Does not look like a seven, I'm going to fix that right there.

Okay, so there is the amount of heat that would be generated when two grams reacts,

so lets write that ratio.

This is negative 36.0 kilojoules

for 2 grams of N2H4 reacting.

Now remember, we don't want it per gram.

We want it for mole.

And we want it for one mole, because that's what the balanced equation is.

So, when we put in the molar mass of hydrazine, which is 32.06 grams per mole.

We will, be as we see here, left with the units of kilojoules for mole hydrazine.