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