** (1) do you think you could find dHf products and dHf reactants via google?**

I think so, i'm not sure if i'm correct though. To clarify, is this equation what you are talking about? ΔH°rxn = Σ ΔH°f (products) − Σ ΔH°f (reactants)

** (2) how would the coefficients factor in?**

That would be how many molecules you have of that element, right? I assume it would need to be multiplied by the "dHf reactants and products" you were talking about.

** (3) how do you suppose entropy works?**

Entropy measures the amount of heat transferred during a reaction from what I was told, if that's the answer your're looking for.

Online school is so much harder to learn than real life haha. Took it for granted...