Burdge/Overby, Chemistry: Atoms First, 2e Ch14 | Page 34
4HBr(g)
198.48
+
O2(g)
2Br2(l)
+
152.3
205.0
2H2O(l)
69.9
H2O(l)
H2O(g)
Br2(l)
O2(g)
HBr(g)
?S° = [2(152.3) + 2(69.9)]
rxn
–
[4(198.48) + 205.0]
=
?H° (kJ/mol)
f
S° (J/K•mol)
f
–285.8
69.9
–241.8
0
188.7
152.3
0
–36.2
205.0
198.48
–554.5 J/K•mol
=
–0.5545 kJ/K•mol
?G° = ?H° – T ?S°
rxn
rxn
rxn
= –?426.8 kJ/mol – (29 ??T???( >(??SSCR????+v????( >(?#c?b?????????W?6????2&?&?V?0?B??W6??r(?drl+f?VW2g&??V?F??"?6?7V?FRF?R7F?F&Bg&VP?V?W&w?6??vR?(?d|+??bF?Rf????v??r&V7F???B#R? +3??'????r????"?2?(i"?t??2???$????(?#3R?b???????"?(?#cb?"???????2??3R?b???????B??cb?"???????R??#r????????B? ?6?7V?FR(?d|+f?"F?R&V7F?????VW7F???B?BS +2?W6P?'???FFg&??V?F??"?B77V?RF?B(?d?l+?B<+f?VW2F???@?6??vRv?F?FV?W&GW&R???(?#??????????"?(?#CR????????2??#"?????????B??CR????????R?( 3?#B????????B?0?W6??r(?drl+f?VW2g&??V?F??"?6?7V?FRF?R7F?F&Bg&VP?V?W&w?6??vR?bF?Rf????v??r&V7F???B#R? +3??3D??r???"?r?(i"4?"?r???$??????R?W7Bf?'7B&??6RF?RWVF??????cR?????????"?(?#SC?R?????????2??S3??2???????B?(?#cR?????????R?( 3SS?R???????B?@?6?7V?FR(?d|+f?"F?R&V7F?????VW7F???B?2B( 3#R? +2??'???W6RFFg&??V?F??"?B77V?RF?B(?d?l+?B<+f?VW2F????B6??vRv?F?FV?W&GW&R???(?#S3"????????"?(?#Sc#b?b???????2??S3b?????????B?( 3ScCr????????R?( 3Ss?r?B????????c0??'W#?E?6?E?Ss?c2???FBc0?????2#???