Lec-10-Chap13-2-bare
9/23/2011
Directionality of Chemical Reactions
Gibbs free energy. Calculations
1
Lec-10:
Thermodynamics:
Directionality of Chemical
Reactions. Gibbs Free Energy
Chapter 13
1
Wednesday, September 28,
(in the first half of the lecture)
Discussion about the course with
Professor Troy Wolfskill
Professor Fernando Raineri
For a process at constant pressure
2
1
ext
constant
p
T
T
P
S
C
dT
T
P
This equation allows us to calculate entropy changes
(at constant pressure) by making calorimetric
measurements.
2
initial
initia
final
fi
l
l
na
S
S
S
S
S
S
From the definition of ∆S it follows that
or, more explicitly
in
final
itial
initial
init
final
l
l
a
fina
i
T
T
S
T
T
T
T
C
dT
S

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