Excess enthalpies in the gas phase for the ethylene‐carbon dioxide system have been measured by a continuous‐flow isothermal calorimeter. Excess enthalpies are presented for mol fractions ranging from approximately 0.15 to 0.85, at three temperatures: 298.15, 318.15 and 338.15 K. For each isotherm, measurements were made at four pressures: 1.036 MPa (150 psia), 2.072 MPa (300 psia), 3.454 (500 psia) and 4.835 MPa (700 psia). The experimental results are compared with predictions using the Benedict‐Webb‐Rubin and Redlich‐Kwong equations of state.

A flow calorimeter for measuring enthalpies of mixing of gases was constructed. Enthalpies of mixing for the system N2-02 were measured at four temperatures (10,25, 45, and 65 °C). For each of the four temperatures, measurements are reported at two pressures: 3.55 and 7.60 MPa (35.0 and 75.0 atm, respectively) for the 10, 45, and 65 °C isotherms, and 3.55 and 6.90 MPa (35.0 and 68.2 atm, respectively) for the 25 °C isotherm. All measurements were made in the gas phase region. The experimental results are compared with predictions using the Redlich-Kwong equation of state, with the mixing rule proposed by Chueh and Prausnitz.

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