How do you calculate deltaHf using the # of moles from a balanced equation?

Question

How do you connect the Law of Conservation of Energy to a Thermochemical Equation?

Thanks so much!

Answer 1

It would be so much easier to explain if you had a problem.

Answer 2

Ok, well it gives us the equation:

CH4 + 2O2 --> CO2 + 2H20 ( I balanced it)

And then it asks us to calculate: deltaHf (#of mol) I think we have to do that using the mole ratio and the balanced equation?

Sorry if it's confusing :/

Answer 3

It's done this way; you need to look up the dHf values(heat formation) in tables which usually can be found in your text.
dHrxn = (n*dHf products) - (n*dH reactants)