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Systems and surroundings, state functions, work and heat, internal energy and the first law of thermodynamics, with work done by an expanding gas.
The calculations that JEE, AP Chemistry and A-Level Chemistry ask most: work in reversible and irreversible expansions, Born-Haber and Hess cycles, bond enthalpies, and ΔG from ΔH and ΔS, with a full timed paper.