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Combustion products in a gas turbine expand adiabatically from a pressure of 4 bar and a temperature of 880ºC to a pressure of 1 bar and a temperature of 550ºC. Assuming the reversible path 1-b-2 and that the process 1-b is adiabatic, determine the ∆s. Consider the value of Cp = 1 J / g K

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