This book is the third of the series, which provides an extensive coverage of Physical Chemistry 3. Each volume includes a large number of illustrative numerical and typical problems to highlight the principles involved. IUPAC recommendations and SI units have been adopted throughout. The present book describes Applications of Thermodynamics to the Equilibrium between Phases, Colligative Properties, Phase Rule, Solutions, Phase diagrams of One-Two and Three component Systems and Electrochemical Cells. This book is strongly recommended for B.sc student. Salient Features: • Comprehensive coverage to applications of thermodynamics to the equilibrium between phases, colligative properties, phase rule, solutions, phase diagrams of one-, two-and three-component systems and electrochemical cells • Emphasis given to applications and principles • Explanation of equations in the form of solved problems and numerical • IUPAC recommendations and SI units have been adopted throughout • Rich and illustrious pedagogy