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## PowerPoint Slideshow about ' Energy Diagrams I' - quinlan-carver

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Gibbs standard free energy change (DGo)

Enthalphy (DHo): the heat given off or absorbed

during a reaction

Entropy (DSo): a measure of freedom of motion

Thermodynamic Quantities

DGo = DHo - TDSo

DG,DH,DS,DE are state functions

E = q + w

H = qp

If DSo is small compared to DHo, DGo ~ DHo

Example: PhotosynthesisEnergy Capture (Endergonic Reaction)

n CO2(g) + n H2O(g) + energy

PhotosynthesisEnergy Capture (Endergonic Reaction)

n CO2(g) + n H2O(g) + energy

PhotosynthesisEnergy Capture (Endergonic Reaction)

n CO2(g) + n H2O(g) + energy (CH2O) n (aq) + n O2(g)

An Endothermic (Endergonic) Reaction

Exothermic Reactions : Energy Release

2 C8H18 + 25 O2 16 CO2 + 18 H2O

An Exothermic (Exergonic) Reaction

Exothermic Reactions : Energy Release

2 C8H18 + 25 O2 16 CO2 + 18 H2O

H

16 CO2 + 18 H2O

(Products are all the same.)

Are isomers the same thermodynamically?

Exothermic Reactions : Energy Release

2 C8H18 + 25 O2 16 CO2 + 18 H2O

A

B

C

H

D

16 CO2 + 18 H2O

(Products are all the same.)

Which isomers are more stable thermodynamically?

D > C > B > A

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