(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...