**CHE123T**

The course contains the basics of thermodynamics and its applications in chemistry. Classical thermodynamics will be taught in this course which includes the first, second and third laws of thermodynamics. Concepts of related topics, like mechanical work, internal energy, enthalpy, entropy, different types of free energies are also included in the syllabus and will be thoroughly discussed.

Systems of variable compositions, chemical equilibrium and colligative properties are also part of this course as the extension and application of thermodynamics in chemical systems.

The detailed discussions of the above mentioned topics will be done in the class along with necessary derivations and visual aids. This course will enable the students to learn more advanced topics in thermodynamics, kinetics, electrochemistry etc in future.

**SYLLABUS**__Chemical
____Thermodynamics__: Intensive and
extensive variables; state and path functions; isolated, closed and open systems. First law: Concept of heat, Q, work, W, internal energy, U, and
statement of first law; enthalpy,
H, relation between heat capacities, calculations of Q,
W, ΔU and ΔH for reversible, irreversible and free expansion of gases (ideal and van der Waals) under isothermal and
adiabatic conditions.

Thermochemistry:
Heats of reactions: standard states; enthalpy of formation and enthalpy of combustion and its applications;
effect of temperature (Kirchhoff’s equations) and pressure on enthalpy of reactions.

Second Law: Concept of entropy; thermodynamic scale of temperature, statement of the second law of thermodynamics. Calculation of entropy change for reversible and irreversible processes.

Third
Law:
Statement of third
law, concept of residual entropy, calculation of absolute entropy of molecules. Free
Energy Functions: Gibbs and Helmholtz energy; variation of S, G, A with T, V, P; Free energy
change and spontaneity. Relation between Joule-Thomson coefficient and other thermodynamic
parameters; inversion temperature; Gibbs-Helmholtz equation; Maxwell relations; thermodynamic
equation of state.
Systems
of
Variable Composition: Partial
molar quantities, dependence of thermodynamic parameters on composition; Gibbs Duhem equation, chemical potential of ideal mixtures, change in thermodynamic
functions in mixing of ideal gases.

__Chemical
____Equilibrium__: Criteria of
thermodynamic equilibrium, degree of advancement of reaction, chemical equilibria in ideal gases.
Thermodynamic derivation of relation between Gibbs free energy of reaction and reaction quotient.
Equilibrium constants and their quantitative dependence on temperature, pressure and concentration (Le Chatelier Principle,
Quantitatively). Free
energy of mixing and spontaneity. equilibrium between ideal gases and a pure condensed phase.

__Solutions and Colligative Properties__: Dilute solutions;
lowering of vapour pressure, Raoult’s and Henry’s Laws and
their applications. Thermodynamic derivation using chemical potential to derive relations between the
four colligative properties [(i)
relative lowering of vapour pressure, (ii) elevation of
boiling point, (iii) Depression of freezing point, (iv) osmotic pressure] and amount of solute.
Applications in calculating molar masses of normal, dissociated and associated solutes in solution.

- Teacher: Soumendra Nath Bandyopadhyay