The false statement among the following is:
Correct answer: D. The heat of formation of a compound is equal in magnitude to the heat of combustion
- A. The heat liberated during the neutralization of a strong acid and a strong base in aqueous solution is constant
- B. The heat of combustion is always an exothermic change
- C. The enthalpies of the formation of carbon dioxide can be conveniently determined if the heat of combustion data of carbon is given
- D. The heat of formation of a compound is equal in magnitude to the heat of combustion
Explanation
The statement is not true. The heat of formation and the heat of combustion are two different thermodynamicquantities related to chemical reactions, and their magnitudes are not necessarily equal for all compounds.
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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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