1. School of Chemical Engineering, Cornell University, Ithaca, New York 14853, Chemistry Department, City College of New York, Convent Avenue at 138th Street, New York, New York 10031, Departamento de Termodinámica y Fenómenos de Transferencia, Universidad Simón Bolívar, Caracas 1080-A, Venezuela, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695