Final answer:
A chemical reaction with a positive ∆H value of 73.54 kJ is endothermic, meaning it absorbs heat from its surroundings.
Step-by-step explanation:
If ∆H = 73.54 kJ for a chemical reaction, that reaction is endothermic. The positive value of ∆H indicates that the energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed in the products. This means that the reaction absorbs heat from its surroundings. For a reaction to be exothermic, it would need to have a negative ∆H value, signifying that more energy is released during product bond formation than is used for reactant bond breaking, resulting in a release of heat to the surroundings.