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- Two kilograms of a gas (either air or carbon dioxide) are heated from 200 C to 500 C in a heat exchanger at constant pressure. What can you say about the entropy change for the process? (Cp (air) = 1.005 kJ/kg. K; C, (CO2) = 0.846 kJ/kg.K) (A) The entropy change is the same for air and carbon dioxide. (B) The entropy change is greater for air than carbon dioxide. (C) The entropy change is greater for carbon dioxide that air. (D) The entropy change is zero in both cases. (E) Not enough information to determine entropy change for the process