Treats the fundamentals of time-independent quantum and statistical mechanics as they apply to problems of interest to chemists. Stresses the practical, computational side of physical chemistry rather than the theoretical. Emphasizing computations, it takes the reader step by step through various calculations, including a Hartree-Fock calculation of the ground-state energy of LiH and a calculation of stationary properties of real gases and liquids from virial expansions and distribution functions. Selected topics lend themselves to numerical work which is intermediate in difficulty. Chapters are informally written and are designed to enhance creative thinking. The intelligent use of the microcomputer is integrated throughout the text.