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Chapter 3

Thermodynamics 11: Enthalpy, Heat

Capacity, Entropy, the Second and

Third Laws of Thermodynamics, and

Gibbs Free Energy

INTRODUCTION

1. Enthalpy: Thermodvnamics - Chapter 3 5, Second
H-U+pV and Third
Laws of
Thermodynamics
7. Long Questions 6. Multiple-Choice Quiz 4. Gibbs
Free Energy: G = H - TS

Figure 3.1 Summary of the contents of Chapter 3

ENTHALPY, H
At constant pressure p, for a system with internal energy U and
volume V, the enthalpy is defined as, H = U + pV. The change in
enthalpy, AH, is then expressed as AH = A U + PA V. From Chapter