All of the following statements are false except
Correct answer: D. q = H = E at constant P or at constant V
- A. q = H at constant T; q = E at constant V
- B. q = H at constant V; q = E at constant P
- C. q = H at constant P; q = E at constant V
- D. q = H = E at constant P or at constant V
Explanation
q = H = E at constant P or at constant V: This statement is true. At constant pressure (P) or constant volume (V), the heat transfer (q) equals the enthalpy change (ΔH), which also equals the change in internal energy (ΔE). Therefore, this statement is not false.
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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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