Why is the enthalpy of sublimation equal to the sum of enthalpy of fusion and enthalpy of vaporisation ?

Enthalpy is

Define enthalpy of reaction.

What is standard enthalpy of formation

Enthalpy of sublimation of a substance is equal to

Ionization enthalpy of an atom is equal to

Ionization enthalpy of an atom is equal to

Enthalpy of sublimation of a substance is equal to :

Choose the reaction, for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:

The enthalpy is maximum for

Enthalpy of dissociation is low for