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Module 2-Problem Sheet

# Module 2-Problem Sheet - Problem Sheet Entropy 1 Imagine a...

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Problem Sheet - Entropy 1. Imagine a Carnot engine that operates between the temperatures T H = 850 K and T L = 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. [a] What is the efficiency of this engine? [b] What is the average power of this engine? [c] How much energy is extracted as heat from the high- temperature reservoir every cycle? [d] How much energy is delivered as heat to the low-temperature reservoir every cycle? [e] What is the entropy change of the working substance for the energy transfer to it from the high-temperature reservoir? From it to the low-temperature reservoir? 2. A carnot’s engine has an efficiency of 22.0%. It operates between constant-temperature reservoir in temperature by 75 0 C. What are the temperatures of the two reservoirs? 3. Calculate the change in the melting point of naphthalene for one atmosphere rise in pressure given that its melting point is 80 o C. Latent heat of fusion is 4563 cal/mol and increase in volume on fusion is 18.7 cm 3 per mol and 1 calorie = 4.2×10 7 ergs.

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