Definition: this is the substance(s) formed in a chemical reaction Example: found on the right side of the arrow in a chemical equation
Hint: First two letters (pr)

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.