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What is Enthalpy?

by Team Goseeko

Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals the total content of heat of a system, equivalent to the system’s internal energy plus the product of volume and pressure.

In thermodynamics, the enthalpy is the measure of energy in a thermodynamic system. It is the thermodynamic quantity equivalent to the total heat content of a system

The Heat of Reaction is known (also known as Enthalpy of Reaction), the reaction occurs at constant pressure.

The heat of reactionalso brings about a change in the chemical reaction.

It is a state function and a thermodynamic unit for measurement. They are used to calculate the amount of energy per mole and produced either in the reaction or released in the reaction.

The derivation from pressure, volume, and internal energy, all of which come under the state functions.

Additionally, the process that begins at constant pressure, and after that the heat evolves itself (either absorbed or released) is equal to the change in enthalpy.

The Enthalpy change denotes the symbol “U” and refers to the sum of internal energy and product of volume and Pressure, denoted by PV, as shown


It is also a state function completely based on state functions P, T and U.

The changes normally shown by the change in enthalpy (ΔH) of a process between the beginning and final states.


when the pressure and temperature does not show changes throughout the process and the task is limits itself to pressure and volume, thereafter the change in the reaction of the enthalpy is


The flow of heat (q) at constant pressure in a process equals the change in enthalpy based on the following equation,


Any Enthalpy of a reaction is dependent on its physical conditions of the surroundings such as pressure, temperature etc. In order to specify the standard of any reaction,

Additionally the calculation of the components of the reaction that participate in the reaction are in standard form, the components include reactants and products. 

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