1. Using the appropriate table, determine the change in specific entropy between the specified states, in Btu/ lb ? 8R.
(a) water, p1 5 1000 lbf/in.2, T1 5 8008F, p2 5 1000 lbf/in.2, T2 5 1008F.
(b) Refrigerant 134a, h1 5 47.91 Btu/lb, T1 5 2408F, saturated
2. Propane undergoes a process from state 1, where p1 5 1.4 MPa, T1 5 608C, to state 2, where p2 5 1.0 MPa, during which the change in specific entropy is s2 2 s1 5 20.035 kJ/kg ? K. At state 2, determine the temperature, in 8C, and the specific
enthalpy, in kJ/kg.
3. Air in a piston-cylinder assembly undergoes a process from state 1, where T1 5 300 K, p1 5 100 kPa, to state 2, where T2 5 500 K, p2 5 650 kPa. Using the ideal gas model for air, determine the change in specific entropy between these states, in kJ/kg ? K, if the process occurs (a) without internal irreversibilities, (b) with internal irreversibilities.