Heat absorbed by a substance at constant pressure is equal to _?
Correct answer: B. ∆H
- A. ∆G
- B. ∆H
- C. ∆E
- D. ∆H-∆E
Explanation
Delta G (ΔG) represents the change in Gibbs free energy of a chemical reaction or a physical process The heat absorbed by a substance at constant pressure is equal to the change in enthalpy (ΔH) of the substance. Enthalpy is a thermodynamic property that describes the total energy of a system, including its internal energy and the energy required to displace the environment. Delta E refers to the change in the internal energy of a system. Internal energy is the sum of the kinetic and potential energies of the particles that make up the system, including molecules, atoms, and ions. The relationship between ΔH (change in enthalpy) and ΔE (change in internal energy) of a system is given by the following equation:ΔH = ΔE + PΔV
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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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