19. Chemical Thermodynamics

The standard molar entropy for Br₂(g) is 245.46 J/(mol·K) at 25°C. Given that ΔS° = 104.58 J/K for the dissociation of one mole of Br₂(g) into Br(g) at 25°C, find the standard molar entropy for Br(g) at 25°C.

Calculate the change in entropy (ΔS) that occurs in a system when 1.50 mol of isopropyl alcohol melts at its melting point of -89.5°C, given that the enthalpy of fusion (ΔH_fus) is 5.37 kJ/mol.

For 1 mol of molecules randomly distributed among bulbs A, B, and C, use Boltzmann's formula to calculate the entropy of the state. If the number of microstates is 27, what is the entropy?