Answer:
The standard molar entropy for Br(g) at 25°C is 175.02J/K mol.
Explanation:
[tex]Br_2(g)\rightarrow 2Br(g),\Delta S^o=104.58 J/K [/tex]
[tex]\Delta S^{o}_{m,Br_2}=245.46 J/(mol/K)[/tex]
[tex]\Delta S^o=2 mol\times \Delta S^{o}_{m,Br} - 1 mol\times\Delta S^{o}_{m,Br_2}[/tex]
[tex]\Delta S^o= \sum \Delta S^{o}_{Products}-\sum \Delta S^{o}_{reactants}[/tex]
[tex]104.58 J/K=2 mol\times \Delta S^{o}_{m,Br} -1 mol\times 245.46 J/(mol/K)[/tex]
[tex]2 mol\times \Delta S^{o}_{m,Br}=350.04J/K[/tex]
[tex]\Delta S^{o}_{m,Br}=175.02J/K mol[/tex]
The standard molar entropy for Br(g) at 25°C is 175.02J/K mol.
