The tutorial presents tasks with answers for the course "Molecular Physics" with the addition of theoretical material necessary for their solution. The manual covers questions in statistical physics (Maxwell, Boltzmann, Maxwell-Boltzmann, Gibbs distributions; theory of heat capacity), physical kinetics (transfer phenomena in dense and ultra-rarefied ideal gases) and thermodynamics (1st and 2nd principles of thermodynamics, entropy, theory of thermodynamic potentials, Joule-Thomson process, phase transformations, etc.).