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Paperwork

Paperwork. Today Problems ch.20 ?’s Friday Guest Lecture to Kick off Ch. 21 What are on quizzes? Seriously – Read chapter (Yellow!). Lab 3 Thoughts. Exemplified heat engine processes Quantitative analysis of work done. Entropy Question.

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Paperwork

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  1. Paperwork • Today • Problems ch.20 • ?’s • Friday • Guest Lecture to Kick off Ch. 21 • What are on quizzes? • Seriously – Read chapter (Yellow!)

  2. Lab 3 Thoughts • Exemplified heat engine processes • Quantitative analysis of work done

  3. Entropy Question • A 740 g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K. The compression reduces the volume of the gas from 0.40 m3 initially, to 0.32 m3 finally. The molecular mass of the gas is 320 g/mol. The entropy change for the gas, in SI units, is ? • Entropy, Ideal Gas, Energy Tools:

  4. First Thought • Entropy Change positive or negative? • Is it zero? • Why do we usually talk about DS & not S?

  5. 2nd thought • Parameters • Initial • Final • Tools

  6. What are constants? • Temperature? • Yes 330 K • Mass (Moles)? • Yes: Mass = 740 g & M.M. = 320 g/mol • # moles = • n = 2.31 moles • Volume? • No: Goes from 0.4 to 0.32 m3. • Pressure? • No: Increases • Heat? • No. dQ = dU + dW • dQ = dW, dW not likely zero with volume change • Fill in previous page, Follow main entropy Equation Next

  7. Fill in & Follow Thru • Parameters (SI UNITS): R=8.31 • Initial • V1 = 0.4 n1 = 2.31 T1 =330 • p1 = (nRT)/V = 15357 • Final • V2 = 0.32 n2 = 2.31 T2 =330 • p2 = (nRT)/V = 19161 • Tools

  8. Equation FunIsothermal Implications

  9. Equation FunInsert Ideal Gas Constraint Entropy Units? Why not use: dQ = nCdT?

  10. Make Random EngineMake p-V Diagram Calculate Work Done, Entropy Constraints Ideal Gas cV = 3R/2, CP = 5R/2 (monotomic) For Each Cycle: Something Constant Tools

  11. Friday Guest Lecture Ch. 21

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