enthalpy

The given reaction is shown below. {eq}{\rm{Fe}}\left( {\rm{s}} \right) + 2{\rm{HCl}}\left( {{\rm{aq}}} \right) \to {\rm{FeC}}{{\rm{l}}_2}\left( {\rm{s}} \right.

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.

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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.

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.

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Enthalpies of formation are set H values that represent the enthalpy changes from reactions used to create given chemicals. If you know the enthalpies of formation required to create products and reactants in an equation, you can add them up to estimate the enthalpy much as you would with bond energies as described above.

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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.

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Enthalpy and entropy are thermodynamic terms that we often use with chemical reactions. The key difference between enthalpy and entropy is that enthalpy is the heat transfer takes place in a constant pressure whereas entropy gives an idea of the randomness of a system.

Using the standard enthalpies of formation, what is the standard enthalpy of reaction?

Enthalpy / n l p i / (), a property of a thermodynamic system, is equal to the system’s internal energy plus the product of its pressure and volume. In a system enclosed so as to prevent mass transfer, for processes at constant pressure, the heat absorbed or released equals the change in enthalpy.

Pressure: Atmospheric pressure at 1,01325 bar, i.e. normal atmospheric pressure on the sea level at 0C.