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Define and explain the term enthalpy. 

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What is meant by enthalpy of a system?

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Enthalpy (H) : It is defined as the total energy of a system consisting of internal energy (U) and pressure – volume (P × V) type of energy, i.e. enthalpy represents the sum of internal energy U and product PV energy. It is denoted by H and is represented as

Explanation :

  • Enthalpy represents total heat content of the system. 
  • Enthalpy is a thermodynamic state function.
  • Enthalpy is an extensive property. 
  • The absorption of heat by a system increases its enthalpy. Hence enthalpy is called heat content of the system. 

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