The enthalpy change of a reaction which involves the formation of the compound from its elements at S.T.P. is called?
Correct answer: A. Enthalpy of formation
- A. Enthalpy of formation
- B. Enthalpy of combustion
- C. Enthalpy of neutralization
- D. Enthalpy of sublimation
Explanation
The standard enthalpy of formation of a compound is the amount of heat absorbed or evolved (enthalpy change) when one mole of a compound is formed from its elements. For instance: Mg +½O2 ------> MgO ΔHf=-692 kJ/mol
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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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