Question

Why is the heat evolved or absorbed during the reaction associated with enthalpy (H) rather than free energy (G) or internal energy (U)?

Answer 1

Since most of the chemical reaction occur under conditions of constant pressure and heat of reaction under constant pressure condition is equal to enthalpy change ()

(q_{p = )}

₌

_{= q + w + p}

= q_p —p+ p = q_p

_{(State function G predict spontaneity of a process at constant P & T)}

_{kindly rate plz.}