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Hydrogen, acting as a van der Waals gas (EOS shown below), is compressed in an isothermal...

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Mechanical Engineering

Hydrogen, acting as a van der Waals gas (EOS shown below), iscompressed in an isothermal closed system process from 6.236m3/kgto 0.629m3/kg at 300K. What is the change in specific entropy ofthe gas? (use the entropy change relation in chapter 12)

P = RT/( v − b) − a/( v^2) (1)

a = 27R^2Tcrit^2/(64Pcrit) (2)

b = RTcrit/ (8Pcrit) (3)

Following example 12-7 in the book the change in internal energyof a van der Waals gas for an isothermal process can be derived(the result is shown below). Using the definition of boundary work(wb = R P dv) and conservation of energy what is the amount of heatwhich is rejected by the compression process?

u2 − u1 = a (1/v1 − 1/v2)

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