Training manual for students of chem. fac. - Saratov: New wind, SGU them . N. G. Chernyshevsky, 2009. - 107 s. This textbook is intended for students of chemical and biological specialties of universities starting to practical development of quantum chemistry. In brief, the manual gives the basic concepts of quantum mechanics and quantum chemistry . In an accessible form, the methodology of quantum calculations is presented by methods based on various approximations. The material is presented in accordance with the program of the course "Quantum Mechanics and Quantum Chemistry" of the specialty "Chemistry" ..