There is -1.01 kJ/K*kg. We will use the change in entropy formula: Δs = Cp × ln(Tf / Ti), where Tf and Ti indicate the final and the initial temperature, respectively.
Define final and initial temperature: Tf= 20 °C, Ti = 100 °C.
Solve the equation (specific heat at constant pressure Cp = 4.1818 kJ/K*kg).
The result is -1.01 kJ/K*kg.
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