Enthalpy: Is the total heat

Enthalpy is the total heat content of a system, which helps us understand different energy relations. Learn standard conditions for measuring enthalpy and FAQs. It is the difference between the enthalpy after the process has completed, i.e. the enthalpy of the products assuming that the reaction goes to completion, and the initial enthalpy of the system, namely the reactants. Read this tutorial to learn about enthalpy and how it applies to thermodynamics. Learn about the equation and some some of its applications! Enthalpy Change Accompanying a Change in State When a liquid vaporizes the liquid must absorb heat from its surroundings to replace the energy taken by the vaporizing molecules in order for the temperature to remain constant. This heat required to vaporize the liquid is called enthalpy of vaporization (or heat of vaporization). For example, the vaporization of one mole of water the enthalpy is given as: ΔH = 44.0 kJ at 298 K When a solid melts, the required energy is similarly called ...