CHM 1311 Final: CHM1311 Final Notes Part 3

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 1311
• Professor: Wendy Pell

Document Summary

Closely realted to effusion the gaseous diffusion. The movement of one gas through another. For two gases at equal pressure, such as nh3 and hcl the rate is. The reason for this dependence on molar mass is the same as it is for effusion rates. Lighter molecules have higher average speeds than heavier molecules, so they move farther in a given time. From the particles diameter the mean free path can be calculates. The average distance it travels between collisions at a given temperature and pressure. Divide the most probable speed (m/s) by the mean free path (m/collion) and you obtain the collision frequency, the average number of collisions per a second that each particle undergoes. In any thermodynamic study, measuring the change in energy, the first step is to define the system. The part of the universe that we are focusing on. The moment that we define the system. Everything else is defined as the surroundings.