A pistoncylinder device contains 5 kg of H₂ and 21 kg of N₂ at 160 K and 5 MPa. Heat is now transferred to the device, and the mixture expands at constant pressure until the temperature rises to 200 K.

a.) Determine the heat transfer during this process by treating the mixture as an ideal gas. Use the table containing the molar mass, gas constant, and critical-point properties and the table containing the ideal-gas properties of air.

b.) Determine the heat transfer during this process by treating the mixture as a nonideal gas and using Amagats law. The universal gas constant is R_u = 8.314 kPam³/kmolK. Use the table containing the molar mass, gas constant, and critical-point properties; the generalized enthalpy departure chart; and the table containing the ideal-gas properties of air.