Estimate how many times per second a collision of a molecule of oxygen gas occurs with one of the walls of its con tainer, which is a cube with sides 1.0m. There are 2.0 mol of oxygen inside at 20C Hine Let -J Consider a container of oxygen gas at a temperature of 20C that is 0.50 m tall. Compare the gravitational potential energy of a molecule at the top of the container (assuming the potential energy is zero at the bottom) with the aver age kinetic energy of the molecules. Is it reasonable to neglect the potential energy?