Consider the equilibrium system below. Upper N upper H subscript 4 upper H upper S (s) double-headed arrow upper N upper H subscript 4 upper C l (g).

If the system is at dynamic equilibrium, which statement is true?
Sublimation of the NH4CI crystals stops.
Solidification of the NH4CI vapors stops.
The rate of sublimation of the NH4CI crystals is equal to the rate of solidification of the NH4CI vapors.
The rate of sublimation of the NH4CI crystals is higher than the rate of solidification of the NH4CI vapors.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.