of which of the following reaction(s) may be directly taken as enthalpy of combustion of the concern — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

Standard enthalpy of combustion requires the complete oxidation of exactly 1 mole of a substance. Reaction (a) reflects this for 1 mole of C. Reaction (b) is for 2 moles. Reaction (c) features incomplete combustion (forms CO).