enthalpy

[Karina Koo 2H]

Can someone just conceptually explain what enthalpy is? I still dont quite get it because according to the textbook, enthalpy is a state function that keeps track of losses of energy as expansion work during heat transfer at constant pressure. So I would think enthalpy as something to do with work. but the textbook also states that change in enthalpy is equal to the heat released or absorbed at constant pressure which has to do with heat instead. Thank you!

[Adam Vuilleumier 2K]

Enthalpy is the amount of heat energy in a system. It is equivalent to q when pressure is constant. So when a problem gives you the enthalpy instead of the q value, chances are that pressure is constant.

[Cameron_Greenberg_3C]

The chemistry definition of enthalpy is the amount of energy held in chemical bonds. Bond enthalpy problems prove this fact as the breaking and forming of bonds sum up the change in enthalpy.