The correct equation for the first law of thermodynamic is:
Correct answer: A. E = q + w
- A. E = q + w
- B. E = w-q
- C. E = q -PV
- D. E = q +PV
Explanation
Option A (E = q + w) is the correct equation because it accounts for both the heat added to the system (q) and the work done on or by the system (w) in determining the change in internal energy (E) according to the first law of thermodynamics.
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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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