Question

The pressure of an enclosed gas depends on: the number of molecules in a unit volume and their average kinetic energy its chemical composition the altitude about sea level the number of atoms per molecule all of the above

Answer 1

The number of molecules in an unit volume and their average kinetic energy. In an enclosure, more molecules means the more frequent the collisions on the enclosure, thus increasing the pressure. Also, a greater average kinetic energy means the molecules will hit the enclosure more frequently and also more energetically, creating more pressure. Chemical composition doesn't factor into pressure, as pressure is based on the movement of the molecules. Lastly, since its enclosed, we don't have to worry about atmospheric pressure.