Question

In which of the enlisted cases, Hess's law is not
applicable?
A
Determination of lattice energy
B
Determination of resonance energy
С
Determination of entropy
D
Determination of enthalpy of
transformation of one allotropic form to
another​

Answer 1

Answer:

determinitation of entropy

Answer 2

Hess's law is not applicable in С)  Determination of entropy.

• Hess’s law of constant heat summation is an outcome of the first law of thermodynamics.
• According to this law, the enthalpy change during a chemical or physical process is the same irrespective of the number of steps involved to reach the final product.
• The enthalpy of atomization, the lattice enthalpy, ionization enthalpy, and electron gain enthalpy, etc. can be calculated for a reaction by constructing the Born-Haber cycle and applying Hess Law.
• Heat changes in allotropic transitions and phase transitions can also be calculated.
• Hess law does not account for the entropy of a substance.