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1.
A gas obeys the following equation of state:
ap²
T
m³K
bar mol
P(vb) = RT +
where a = -0.001 and b = 8 × 10-5 m³
mol
Calculate the entropy change As when the gas changes from state 1 (600 K, 100 bar) to state
J
2 (450 K, 20 bar). The ideal gas heat capacity for this process is Cp = 33.5
mol K

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