what is the difference between aqueous hydrogen fluoride and hydrofluoric acid? do they have different formulas or are they just the same but different names?

Hydrofluoric acid is aqueous hydrogen fluoride (dissolved in water). Hydrogen fluoride will form hydrofluoric acid when it comes in contact with water.

Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.