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Enthalpy (H)

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Maharashtra State Board: Class 12

Definition: Enthalpy

The total heat content of a system at constant pressure is known as enthalpу.

ΔH = ΔU + PΔV

At constant pressure: ΔH = qp​ (heat exchanged at constant pressure).

CBSE: Class 12

Definition: Enthalpy of Combustion:

It is defined as the change in heat enthalpy when one mole of a substance is completely burnt in oxygen.

ΔΗ = Σ (Heat of Combustion of reactant)- Σ (Heat of Combustion of product)

CBSE: Class 12

Definition: Enthalpy of Neutralisation:

It is defined as the heat evolved or decrease in enthalpy when 1 gm equivalent of an acid is neutralised by 1 gm equivalent of a base in solution.

CBSE: Class 12

Definition: Enthalpy of Solution

It is the enthalpy change when one mole of it dissolves in a specified amount of solvent

CBSE: Class 12

Definition: Enthalpy of Dilution

It is the enthalpy change associated with diluting a component in a solution at constant pressure and temperature.

CBSE: Class 12

Definition: Enthalpy of Hydration

It is the enthalpy change during the hydration of 1 mole of anhydrous salt by the addition of a specific number of moles of water.

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