chem 433 - 11/27/10
DESCRIPTION
CHEM 433 - 11/27/10. III. 2 nd Law of THERMO • “Machinery” - Finish last bit of the “dU story” ( p T ) - Properties of dG ( 3.9 ) • P & T Dependence of the Gibbs Energy (3.9): - T dependence READ: FINISH CHAPTER 3. - PowerPoint PPT PresentationTRANSCRIPT
CHEM 433 - 11/27/10
III. 2nd Law of THERMO
• “Machinery”
- Finish last bit of the “dU story” (T)
- Properties of dG (3.9)
• P & T Dependence of the Gibbs Energy (3.9):
- T dependence
READ: FINISH CHAPTER 3
€
∂G∂T
⎛
⎝ ⎜
⎞
⎠ ⎟p
= −S
€
∂G∂p
⎛
⎝ ⎜
⎞
⎠ ⎟T
=V
P 3.37: rG° of sucrose “combustion”: Is there an advantage to metabolism at 37°C vs. 25°C? Why?
C12H22O11 + __ O2 —> 12 CO2 + 11 H2O
“Is …” —> Calculate rG° at 310K.
rH° = -5645 kJ/mol
rG° = -6333 kJ/mol
“Why?”—> Is rS° + or - for this reaction?