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

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∂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?