Why in the definition of enthalpy of fusion the melting of one mole of solid substance is at STANDARD STATE and in molar enthalpy of vaporization and enthalpy of sublimation it is written that it is at constant temperature and under STANDARD PRESSURE so what is there a difference in definitions

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Q. Define enthalpy of sublimation. How is it related to enthalpy of fusion and enthalpy of vaporization?

Q. The standard molar enthalpy of a substance is the enthalpy of the substance at what pressure .

Q. The species which by definition has zero standard molar enthalpy of formation at

298 K

is:

Q. The species which by definition has zero standard molar enthalpy of formation at 298 K is :

Enthalpy of sublimation of a substance is equal to
(a) enthalpy of fusion + enthalpy of vaporisation
(b) enthalpy of fusion
(c) enthalpy of vaporisation
(d) twice the enthalpy of vaporisation

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