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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
\[q_p = H_f-H_i = \Delta H\]. So the enthalpy is nothing more than an invention of a new energy that is equivalent to the heat flow as measured at constant pressure. If the change is not at constant pressure then enthalpy is something, but it is not equal to the heat flow.There are two other important chemical terms that we associate with enthalpy change. When a process lowers the enthalpy of the system, \(\Delta H exothermic endothermic. Ice melting is an endothermic process.Energy is absorbed by the system in the form of heat flow that leads to the solid converting to a liquid.here are two other important chemical terms that we associate with enthalpy change. When a process lowers the enthalpy of the system, \(\Delta H exothermic endothermic. Ice melting is an endothermic process. Energy is absorbed by the system in the form of heat flow that leads to the solid converting to a liquid.