How is the enthalpy change for a reaction related to the enthalpy of the reactants and products?

Question

Is it that the enthalpy for the reactants and products equals the enthalpy change for the reaction?

Answer 1

dSrxn = (n*dSproducts) - (n*dSreactants)

Answer 2

what does N equal? Is that the number of mols?

Answer 3

Yes, n is the number of mols. I goofed when I wrote dS when I meant dH. S is entropy, H is enthalpy.