|I||The products have more energy than the reactants||In this case de products have gained energy;
this is only possible when the system gained energy from outside (ΔH > 0).
|II||The products have less energy than the reactants||Here the reactants lost energy;
the system has donated energy to the outside environment. (ΔH < 0).
|III||The products have the same energy as the reactants||In this case there is a chemical equilibrium. (ΔH = 0).|