Gas Law

When a gas is heated at constant volume the heat supplied is used to, (a) increase the translational kinetic energy of the gas molecules and…

Heat Capacities of Gases: Heat capacity of a substance is defined as the heat necessary to raise the temperature of a given quantity of the…

Degree of dissociation Measurement of the density of vapour may be used for calculating the degree of dissociation (α) of substances, i.e., the extent to…

Thermal dissociation explains abnormally low molecular mass obtained for many elements and compounds. Well known examples are the dissociation of Dinitrogen tetroxide (N2O4), Ammonium chloride…

Molecular dissociation Upon heating, the density of aluminum chloride vapour decreases and at 800°C the density corresponds to the formula Aluminium chloride (AlCl3), i.e., one…

Molecular association is an attractive interaction between two molecules that results in a constant association in which the molecules are in close propinquity to each…

Abnormal Densities of Gases: Molecular Association and Dissociation Density defined in a qualitative manner as the measure of the relative “heaviness” of objects with a…

The buoyancy method This is a very accurate method of determining gas density. A very small quantity of the gas is sufficient for measurement by…

Method of limiting density The methods: Regnault’s method, Dumas method, Hofmann’s method, Victor Meyer’s method, and the buoyancy method are based on the assumption that…

Victor Meyer’s method This is perhaps the most common method for the determination of the molecular mass of substances which are liquid or solid at…