If the amount of heat supplied at constant volume is -10kJ at -45°C temperature then work done on the system is :
Correct answer: D. 0 kJ
- A. 40 kJ
- B. 10 kJ
- C. 20 kJ
- D. 0 kJ
Explanation
In thermochemistry, when a process occurs at constant volume, no work is done on or by the system because work is defined as W = -PΔV, where ΔV is the change in volume. Since the volume doesn't change (ΔV = 0), the work done W is 0 kJ. Therefore, the correct answer is 0 kJ. Options A, B, and C are incorrect because they suggest that work is done, which contradicts the condition of constant volume.
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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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