A measure of the number of possibilities for a given system is o entropy O enthalpy O kinetics thermodynamics

Answer: Entropy

Explanation:

Entropy is the measure of randomness or disorder. It is a thermodynamic state function corresponding to the number of available microstates of a system.

Enthalpy is the difference between the energy of products and the energy of reactants.

Kinetics is the the branch of chemistry which deals with rates of chemical reactions.

Thermodynamics is the branch of chemistry which deals with energy and energy conversions.