asked in category: General Last Updated: 24th March, 2020

# What is the relation between enthalpy and internal energy?

The change in the internal energy of a system is the sum of the heat transferred and the work done. At constant pressure, heat flow (q) and internal energy (E) are related to the system's enthalpy (H). The heat flow is equal to the change in the internal energy of the system plus the PV work done.

In this manner, what is enthalpy and internal energy?

Internal energy is the total energy contained in the system. It is the sum of potential and kinetic energy possessed by the system. Enthalpy is defined as the sum of the internal energy of the system plus the product of the pressure of the gas in the system and its volume.

Similarly, what is the relationship between enthalpy and heat? Enthalpy is the state of a system, assuming constant pressure, while it contains a certain amount of heat. Heat is just the energy that causes those changes. More tangibly, the variable of interest to most people is usually temperature.

In this regard, what is the difference between enthalpy and energy?

Energy is only measured in joules, but enthalpy is measured in both joules and joules per mole. Enthalpy is also a form of energy. Energy is a state of the matter, but enthalpy is always the energy change between two states. Energy can only be positive but enthalpy change can be both positive and negative.

How do you define enthalpy?

Enthalpy is a thermodynamic property of a system. It is the sum of the internal energy added to the product of the pressure and volume of the system. It reflects the capacity to do non-mechanical work and the capacity to release heat. Enthalpy is denoted as H; specific enthalpy denoted as h.

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24th March, 2020

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