Thermodynamics of liquid (nitrogen + ethane)

The equilibrium vapour pressure of liquid {xN2+ (1 − x)C2H6}(l) has been measured atT= 90.69 K. The excess molar Gibbs energiesGmE have been calculated as a function of composition from the vapour pressure data. For the equimolar mixture GmE(x= 0.5) = (985 ± 14)J · mol−1. Excess molar enthalpies HmEhave also been measured at T= (92.1 ± 0.1) K andp= (0.79 ± 0.12) MPa using a low-temperature computer-interfaced high-pressure flow calorimeter. For the equimolar mixtureHmE (x= 0.5) = 426.9 J · mol−1. The results show that the system is only partially miscible at both temperatures. The limits of (liquid + liquid) immiscibility have been determined as 0.123 ± 0.010