Answer to Question #123624 in Molecular Physics | Thermodynamics for Gopaul

Question

A volume of air of 20 liters is at atmospheric pressure (Patm) and a temperature of 0 ° C.
Air, which can be considered an ideal gas, undergoes the following two transformations:
Transformation 1-> 2: Isochorous compression. The air is heated until its pressure is 3Patm.
Transformation 2-> 3: Isobaric expansion. The air is heated until its temperature reaches 600 ° C.
We give for air: Molar mass M = 29 kg / Kmol, cv = 708 J / kg.K,  = 1.4 and Ru = 8.32 KJ / kg.K.
(a) What is the air temperature at the end of the transformation 1-> 2?
(b) Determine the mass of air.
(c) Deduct the internal energy variation of the air for the transformation 1-> 2 (change in U12).
(d) What is the volume occupied by the air at the end of the transformation 2-> 3?
(e) Calculate the variation of the internal air energy for the transformation 2-> 3 (change in U23).
(f) Deduct the variation in energy U13.

Answer 1

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