A constant characterizing these substances equals the difference between two types of heat capacity, per Mayer’s relation. These substances do not change (-5[1])temperature while undergoing a Joule expansion. A fugacity coefficient (10[1])of 1 characterizes these substances, (10[2])which have a value of 0 for the “b” coefficient measuring excluded volume in the van der Waals equation. Avogadro’s number (10[1])times the Boltzmann constant equals (10[1])a constant named for these substances, (10[1])which are typically assumed to have (10[1])no intermolecular forces. (10[1])For 10 points, (10[1])8.314 joules per mole-kelvin is the value of a constant named for what substances, governed by the equation “PV equals nRT”? ■END■