What is difference between enthalpy and internal energy

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Solution

During a reaction internal energy (U) is defined as the heat energy absorbed or released at constant volume. Internal energy is the sum of kinetic and potential energies of the particles that form the system or is normally considered as the energy of the system.
U = K.E + P.E
Whereas enthalpy is defined as the heat absorbed or released during a chemical reaction at constant pressure. The enthalpy (H ) is the heat content of a system and it is a sum of all the internal energy and pressure- volume work done i.e. PV. Actually, H, is the amount of useful energy that can be extracted from a system. It has two components, according to all the formulas that give you little understanding. The first component is what is called the PV energy and the other component is internal energy.
H = U + PV

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