THE EXCESS ENTHALPY OF (YAR-Y)HCL)(G) AND THE 2ND VIRIAL-COEFFICIENT OF HCL FROM T=210 K TO T=370 K((1)

Values of the second virial coefficient B of HCl have been obtained fr om measurements of the excess molar enthalpy H-m(E) of {yAr + (1 - y)H Cl} measured over the temperature range 210 K to 370 K at pressures cl ose to atmospheric. A flow calorimetric apparatus of new design was us ed for the measurements. The value of B for HCl was extracted from the H-m(E) measurements using the spherical-core polar fluid potential of Storvick and Spurling. A knowledge of the second virial coefficient o f argon and of an appropriate combining rule for the calculation of cr oss-terms was assumed. The values of B for HCl extracted from the meas urements are slightly smaller than those obtained by Schramm and Leuch s using a mercury-free (p, V-m, T) technique. (C) 1997 Academic Press Limited