The system is 1 kg of nitrogen, initially at T = 300 K and P = 4 bar. For each of the following cases, find the change in entropy of the system using Figure 2-3, then find the change in entropy again by assuming nitrogen is an ideal gas and using the data in Appendix D.A. The nitrogen is isobarically heated to 330 K.

B. The nitrogen is isobarically cooled to 225 K.

C. The nitrogen is isothermally compressed to P = 10 bar.

D. The nitrogen is compressed to T = 330 K and P = 10 bar.

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THERMODYNAMIC PROPERTIES OF NITROGEN 250 Ĥ,kJ/kg FIGURE 2-3 Thermodynamic diagram for nitrogen. 0 50 100 150 200 300 0007 -3.75 kJ/kg Ki 350 400 0.3 m²/kgl 450 20 10 -8 6 4 -2 N P, MPa -1 O- 0.8 0.6 0.4 0.2 0.1 500 Based on W.C. Reynolds, Thermodynamic Properties in SI, Department of Mechanical Engineering. Stanford University, 1979