enthalpy

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a quantity associated with a thermodynamic system, expressed as the internal energy of a system plus the product of the pressure and volume of the system, having the property that during an isobaric process, the change in the quantity is equal to the heat transferred during the process.

Energy and Enthalpy Enthalpy is a measure of heat in the system. They use the formula H = U + PV.H is the enthalpy value, U is the amount of internal energy, and P and V are pressure and volume of the system.

Chemical Thermodynamics. Thermodynamics is defined as the branch of science that deals with the relationship between heat and other forms of energy, such as work. It is frequently summarized as three laws that describe restrictions on how different forms of energy can be interconverted.

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.

enthalpy – (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work" heat content, total heat, H physical property – any property used to characterize matter and energy and their interactions

Energy and Enthalpy. Enthalpy is a measure of heat in the system. They use the formula H = U + PV. H is the enthalpy value, U is the amount of internal energy,

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Enthalpy is an energy-like property or state function-it has the dimensions of energy (and is thus measured in units of joules or ergs), and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history.

The standard enthalpy of formation is measured in units of energy per amount of substance, usually stated in kilojoule per mole (kj mol 1), but also in kilocalorie per mole, joule per mole or kilocalorie per gram (any combination of these units conforming to the energy per mass or amount guideline).

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