Calculate the change in entropy if Br2 (l) is converted to Br2 (g).

S° for Br2 (l) = 152.2 J / (mol•K)

S° for Br2 (g) = 245.5 J / (mol•K)

S° for Br (g) = 175.0 J / (mol•K)

Ans: The entropy change for the given reaction is 93.3 J/K

Given reaction:

Br2 (l) → Br2 (g)

ΔS = ∑n (products) S⁰ (products) - ∑n (reactants) S⁰ (reactants)

= 1 mole * S° (Br2 (g)) - 1 mole*S° (Br2 (l))

= 1 mole * 245.5 J/mol-K - 1 mole*152.2 J/mol-K

= 93.3 J/K