91Ó°ÊÓ

Entropyis founded on the idea that everything in nature tends to shift from order to disorder in an isolated system. In matter, it is a state of unpredictability. The internal energy of a system is calledenthalpy. Free energy changes are used to determine the spontaneity of a reaction.

The entropy of an energy process usually increases. An increase or reduction in enthalpy and entropy can occur spontaneously. The spontaneity of a reaction is determined by the decrease in free energy, which must be negative. As a result, if entropy falls but enthalpy rises, the free energy change will begreater than zero.

$\mathrm{Δ}G°=\mathrm{Δ}H°−T\mathrm{Δ}S$

Where,

$\mathrm{Δ}G°$is free energy change

$\mathrm{Δ}H°$is enthalpy change

$\mathrm{Δ}S°$is entropy change

Thus, the reaction would not be favourable and spontaneous if entropy of the system has been decreases and the enthalpy of the system increases.