If a container of gas contains a mixture of carbon dioxide that has a pressure of 167 Torr and nitrogen gas that has a pressure of 284 Torr, what will be the final pressure in the container?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.