The O2, so far we've got one and a half mols of O2, okay?

So it looks like it's good.

Now let's make sure we get the SrCO3 in place, okay?

So we look up here and SrCO3 come from the second equation.

It has 1 mole on the right-hand side, so we're going to use it just as we see it.

SrO solid plus CO2 gas producing CrCO3.

Since it's just Sr,

sorry CO3 and that's not a gas.

It's a solid, okay.

So the delta H of this reaction, I read it right off of here is a negative 200, boy,

I'm having a hard time writing, 234 kilojoules.

Now, let's verify that all of these do add up.

To give me the reaction I'm looking for.

I'm trying to obtain this reaction.

So we've got the strontium.

We've got one and half mols of oxygen.

We have Sr0, cancelling with Sr0.

We've got carbon dioxide, cancelling with carbon dioxide.