(a) explanation that entropy is a measure of the dispersal of energy in a system which is greater, the more disordered a system
(b) explanation of the difference in magnitude of the entropy of a system:
(i) of solids, liquids and gases
(ii) for a reaction in which there is a change in the number of gaseous molecules
(c) calculation of the entropy change of a system, ∆S, & related quantities for a reaction given entropies of reactants & products