Abstract
A flow mixing calorimeter and a vibrating-tube densimeter have been used to measure excess molar enthalpies HmE and excess molar volumes VmE of {xC2H6+ (1 −x)SF6 }. Measurements over a range of mole fractions x have been made at T= 305.65 K and T= 312.15 K and at the pressures (3.76, 4.32, 4.88 and 6.0) MPa. The pressure 3.76 MPa is close to the critical pressure of SF6, the pressure 4.88 MPa is close to the critical pressure of C2H6, and the pressure 4.32 MPa is midway between these values. The measurements are compared with the Patel–Teja equation of state which reproduces the main features of the excess function curves as well as it does for similar measurements on {xCO2+ (1 −x)C2H6 }, {xCO2+ (1 −x)C2H4 } and {xCO2+ (1 −x)SF6 }.
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