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(a) Intensive property: a property whose value does not depend on the amount of matter present in the system, e.g. temperature, pressure, density, boiling point, molar volume.

(b) Standard enthalpy of combustion (ΔcH°): the enthalpy change when one mole of a substance in its standard state is completely burnt (oxidised) in excess oxygen, all reactants and products being in their standard states at the given temperature (usually 298 K, 1 bar). e.g. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l), ΔcH° = –890 kJ mol–1.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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