1. Carbon dioxide initially at 50 kPa, 400 K, undergoes a process in a closed system until its pressure and temperatures are 2 MPa and 800 K, respectively. Assuming ideal gas behavior, find the entropy change of the carbon dioxide (Cp = 1.054 kJ/kg.K)
2. Air initially at 0.1 MPa, 27 °C, is compressed reversibly to a final state. Find the entropy change of the air when the final state is 0.5MPa, 227 °C.
3. Air initially at 0.1 MPa, 27 °C, is compressed reversibly to a final state. Find the temperature at 0.5 MPa that makes the entropy change zero.