<prompt> Entropy is a measure of the:Reversibility of reactionRandomness in a systemExothermicityFree energy for an enzymatic reaction  <response>: Entropy is degree of disorder or randomness in a system i.e. movement or vibration of molecules in a system. ADDITIONAL READING: Laws of thermodynamics are: 1 Zeroth law of thermodynamics states that if two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other. This law defines the concept of temperature. 2 First law of thermodynamics states that energy can neither be created, nor be destroyed. It can just be conveed from one form to another. 3 Second law of thermodynamics says that entropy of a system always increases with time. This law defines the concept of entropy. 4 Third law of thermodynamics states that the entropy of a system attains a constant value as the temperature approaches absolute zero. This law tells the relation between temperature and entropy. 