Question

Why is enthalpy of formation negative?

Answer 1

All chemical techniques are observed with the aid of using electricity changes. When a response proceeds, it both releases electricity to, and absorbs electricity from, its surroundings. In thermodynamics, those kinds of reactions are categorized as exothermic or endothermic, respectively. A smooth manner to don't forget the distinction among those response kinds is with the aid of using their prefixes: endo- manner to attract in, and exo- manner to provide off.

Complete answer:
A negative of shows that the formation of a compound is exothermic-the quantity of electricity it takes to interrupt bonds is much less than the quantity of electricity this is launched whilst making the bonds.
For example:
A positive of shows that the formation of a compound is endothermic-the quantity of electricity it takes to interrupt bonds is more than the quantity of electricity this is launched whilst making the bonds.
For example:
Enthalpy (signified as $\Delta H$) is a degree of the entire electricity of a gadget and regularly expresses and simplifies electricity switching among systems. Since the entire enthalpy of a gadget can't be measured directly, we most customarily consult with the alternative in enthalpy for a selected chemical response. At regular pressure, the alternate in enthalpy is identical to the warmth given off, or the warmth absorbed, in a given chemical response

Note:
Exothermic reactions are reactions or techniques that launch electricity, generally within the shape of warmth or light. In an exothermic response, electricity is launched due to the fact that the entire electricity of the goods is much less than the entire electricity of the reactants. Endothermic reactions are reactions that require outside electricity, generally within the shape of warmth, for the response to proceed. Since endothermic reactions attract warmth from their surroundings, they have a tendency to motivate their environments to chill down.