Thermodynamics, Physics 211. I found this solution for the following question. B

Question

Thermodynamics, Physics 211. I found this solution for the following question. But a I am confused how he found the value of 'R'. Please Help Me. The pV diagram in the figure to the right shows a heat engine operating on 0.850 mol of H2. Seqment ca is isothermal. (a) Without doing any calculations, identify the segments during which heat enters the gas and those during which it leaves the gas. Explain your reasoning (b) Find the value of the temperature at all three verticies. (c) Find the change in internal energy, work, and heat during each process of the cycle (d) Find the termal efficiency of this heat engine, treating the gas as ideal and monatomic. (e) Calculate the coefficient of performace if the engine is run in reverse, as a refigerator View comments (1) 0.700 0300 o100 v (

Explanation / Answer

'R' is a Universal Gas constant whose value is  8.31 J mol1 K1 in SI system.

Its value can be computed from the ideal gas equation PV=nRT where n: no.of moles

or from Cp - CV =R where Cp and CV are the specific heats at constant pressure and constant volume respectively

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