Final answer:
The standard entropy change (ΔS°) for the formation of 1 mole of PCl5(g) from its elements can be calculated using the standard entropies of the products and the reactants.
Step-by-step explanation:
The standard entropy change (ΔS°) for the formation of 1 mole of PCl5(g) from its elements can be calculated using the standard entropies of the products and the reactants. The equation for the formation of PCl5(g) from its elements is:
PCl5(g) = P(s) + 5Cl(s)
The standard entropy change can be calculated as:
ΔS° = (ΣS°products) - (ΣS°reactants)
Using the tabulated standard entropies at 298.15 K, the entropy change can be determined.