In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system:

In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system:

Heat of product ${\mathrm{q}}_{\mathrm{p}}$ will be negative while enthalpy change of reactants ${\mathrm{\Delta }}_{\mathrm{r}} \mathrm{H}$ will be negative.