Identify the state function among the following:
Correct answer: B. Q - W
- A. Q
- B. Q - W
- C. Q / W
- D. Q + Q
Explanation
The correct answer is Q - W, which corresponds to the change in internal energy (∆E) of a system. Internal energy is a state function because it depends only on the initial and final states of the system, not on the path taken to reach those states. Other options such as Q and Q / W are not state functions because they depend on the process path. Q + Q is simply a mathematical operation on heat and does not relate to a state function.
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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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