Heat absorbed or evolved during the chemical reaction at constant pressure is:
Correct answer: A. ΔH
- A. ΔH
- B. ΔE
- C. ΔV
- D. ΔH+ΔE
Explanation
The change in enthalpy (ΔH) of a system is defined as the heat transferred at constant pressure. This is a fundamental concept in thermodynamics and explains why enthalpy is such a useful state function for chemists, who often perform reactions in open containers at constant atmospheric pressure.
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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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