The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called:
Correct answer: D. Heat of combustion
- A. Heat of reaction
- B. Heat of atomization
- C. Heat of formation
- D. Heat of combustion
Explanation
This is the precise definition of the standard enthalpy of combustion (ΔH°c ). It refers to the heat change for the complete combustion of one mole of a substance under standard conditions.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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