Question

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

Answer 1

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✏ Option [B.] is Correct

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Answer 2

Enthalpy is a state of function, that is, the enthalpy of a chemical process is independent of the path taken from the initial to the final state. Therefore, the enthalpy of sublimation of a given quantity (solid to gas) should be equal to the summation of enthalpy of fusion (solid to liquid) and the enthalpy of vaporization (liquid to gas), if all the other parameters remain the same in all of these three processes (temperature, pressure, ...)

Studying Hess's law would be helpful to grasp this concept better.Add your answer

Good luck!