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This problem deals with the isothermal, steady-state expansion of isobutane at, 25 [°C], from 1.6 [bar] to 4.0 [bar]. The isobutane may be considered to behave as an ideal gas at the initial pressure. However, at the final pressure, it is no longer an ideal gas. The critical properties (Tc and P) and acentric factor (m) of isobutane are, respectively: 408.1 [K].3.648 [MPa], and 0.181 Requirements: Please calculate and report the following: 1. Reduced temperature: and reduced pressure: 2. First dimensionless virial coefficients of isobutane: Bo: and B: 3. The derivative of the dimensionless virial coefficients of isobutane with respect to the reduced temperature: dBo/d7 and dB/dT: 4. Residual enthalpy of isobutane at the inlet: [kJ/mol), and at the outlet: [kJ/mol] 5. Residual entropy of isobutane at the inlet: [J/mol-K), and at the outlet: [J/mol K] 6. Change of enthalpy in the expansion: [kJ/mol] 7. Change of entropy in the expansion: [J/mol K)