Chemical Thermodynamics for JEE

• State functions: U, H, S, G (path-independent)
• Hess's law: enthalpy changes add
• ΔG < 0 means spontaneous at constant T and P
• ΔG° = −RT ln K links thermodynamics and equilibrium

• ΔH = ΔU + Δn_g RT
• ΔG = ΔH − TΔS
• ΔS = q_rev / T
• Isothermal reversible work W = −2.303 nRT log(V₂/V₁)

Printable Chemical Thermodynamics formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

• Sign convention for work (chemistry uses work done on the system)
• Δn_g counting liquid or solid moles
• Forgetting to convert kJ and J

Appears frequently. Spontaneity with ΔH and ΔS signs is a favourite one-liner question.

Prerequisites: Mole Concept and Stoichiometry.

Chapter names follow the current rationalised NCERT textbooks. Read these sections before solving PYQs.

Question. For the reaction 2SO₂(g) + O₂(g) → 2SO₃(g) at 298 K, given: ΔH°f(SO₂) = -297 kJ/mol, ΔH°f(SO₃) = -396 kJ/mol, S°(SO₂) = 248 J/mol·K, S°(O₂) = 205 J/mol·K, S°(SO₃) = 257 J/mol·K. Calculate (a) ΔH° for the reaction, (b) ΔS° for the reaction, (c) ΔG° at 298 K, and (d) the temperature at which the reaction reaches equilibrium.

This example was solved twice independently and both solutions agree.

Full-chapter free lectures picked from YouTube search results by views, from established JEE channels (mostly in Hinglish). Use the subtopic list to jump straight to the part you need (timestamps come from each video's own chapter list). Watch one, then solve PYQs the same day.

• Thermodynamics FULL CHAPTER | Class 11th Physical Chemistry | Chapter 4 | Arjuna JEE — Arjuna JEE, 5:48:12
  Jump to a subtopic (37)

  • 00:00 Introduction
  • 11:51 Types of System
  • 14:43 State of a System
  • 18:11 State and Path Function
  • 20:38 Extensive Property
  • 23:16 Intensive Property
  • 29:04 Thermodynamic Process
  • 42:06 Reversible and Irreversible Process
  • 50:01 Thermodynamic Equilibrium
  • 53:24 Work
  • 01:02:46 Internal Energy
  • 01:19:59 Thermodynamic Definition of Ideal Gas
  • 01:22:00 Degree of freedom
  • 01:27:20 Law of Equipartition of Energy
  • 01:30:33 Zeroth Law of Thermodynamics
  • 01:32:00 Heat Capacity
  • 01:57:46 Comparison of Work Done
  • 02:09:21 Work Done in Free Expansion
  • 02:20:09 Poisson's Ratio
  • 02:24:31 Work Done in Adiabatic Reversible Process
  • 02:44:24 Enthalpy
  • 02:58:04 Measurement of U
  • 03:10:38 Enthalpy of Reaction
  • 03:19:52 Hess's Law
  • 03:24:13 Standard Enthalpy of Reaction
  • 03:35:45 Standard Enthalpy of Formation
  • 03:46:42 Standard Enthalpy of Combustion
  • 04:03:56 Standard Enthalpy of Atomization
  • 04:06:59 Bond Enthalpy
  • 04:24:06 Lattice Enthalpy
  • 04:24:52 Enthalpy of Neutralization
  • 04:46:15 Spontaneous Process
  • 04:49:07 Entropy and Spontaneity
  • 04:57:51 2nd Law of Thermodynamics
  • 05:19:01 Gibbs Energy And Spontaneity
  • 05:38:07 3rd Law of Thermodynamics
  • 05:45:21 Thank You Bachoo!!
• THERMODYNAMICS in One Shot: All Concepts & PYQs Covered | JEE Main & Advanced — JEE Wallah, 7:13:12
  Jump to a subtopic (37)

  • 00:00 Introduction
  • 06:10 Important terms of thermodynamics
  • 10:45 Types of system
  • 16:07 Zeroth law of thermodynamics
  • 17:43 Extensive and Intensive properties
  • 38:40 State of the system
  • 41:32 State & Path functions
  • 49:20 Thermodynamic processes
  • 1:04:50 Heat
  • 1:07:17 Work done
  • 1:22:05 Sign convention
  • 1:24:14 First law of thermodynamics
  • 1:37:34 Heat Capacity
  • 2:11:50 Poisson’s ratio
  • 2:20:29 Reversible process
  • 2:28:00 Work done for isothermal process
  • 2:47:12 Irreversible processes
  • 2:56:59 Work done by gas in isothermal process
  • 3:12:19 Adiabatic process
  • 3:33:35 Isothermal & Adiabatic P-V graph slope
  • 3:53:32 Molar heat capacity of gaseous mixture
  • 4:05:20 Break
  • 4:28:48 Thermochemistry - Heat
  • 4:39:35 Heat of combustion
  • 4:46:40 Heat of solution
  • 4:49:16 Heat of dilution
  • 5:25:23 Enthalpy of phase transition
  • 5:32:26 Bond energies
  • 5:43:32 Hess’s law
  • 5:45:53 Born-haber cycle
  • 6:01:38 Limitations of 1st law of thermodynamics
  • 6:15:17 Net Entropy
  • 6:36:20 Formulas
  • 6:43:00 Adiabatic rule
  • 6:50:50 Gibbs free energy
  • 7:02:15 Bomb Calorimeter
  • 7:12:12 Thank you bachhon

• 11 JEE Main 2026 PYQs on Chemical Thermodynamics, with solutions.
• Read the chapter in NCERT textbooks (official, free), then solve its NCERT Exemplar (official, free) questions.
• Chapter-wise past questions: JEE Main and Advanced PYQs and question bank.
• Timed practice tests: NTA Abhyas practice tests (official, free) and our free mock tests.
• See it move: interactive simulation.