Is this equation endo- or exo -thermic? 2KNO3(s)+energy- gt 2KNO2(s)+O2 endothermic exothermic

The given equation is $2KNO3(s)+energy-- \gt 2KNO2(s)+O2$. In this equation, energy is being absorbed by the reactants to form the products. This is characteristic of an endothermic reaction, where energy is absorbed from the surroundings. Therefore, the reaction is endothermic.