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Question

What Is The Significance Of The Thermodynamic Enthalpy?


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Solution

Enthalpy:

  • Enthalpy is a state function.
  • The enthalpy, H, is equal to the sum of the internal energy, U, and the product of the pressure, P, and volume, V, of the system.
  • It can be expressed as: H=U+pV.
  • H is a state function because it depends on U, p, and V, all of which are state functions.
  • Therefore, H is independent of the path.
  • Thus, it can be expressed as: H=U+pV.

Significance of Enthalpy:

  • Calculating the change in enthalpy tells whether a reaction is endothermic (absorbed heat, positive change in enthalpy) or exothermic (released heat, a negative change in enthalpy.)
  • It is beneficial in calculating the heat of the reaction of a chemical process.

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