Difference between desirable changes and undesirable changes​

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.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence