CHEM 1001 Lecture 4: Gases lecture 4

• School: Carleton University
• Department: Chemistry
• Course: CHEM 1001
• Professor: Robert Burk

Document Summary

Therefore, rate of effusion is proportionate to velocity. Example: calculate the relative rates of effusion of h2 and he rate rate. The definition of diffusion: gradual dispersion of one substance throughout another. Initially there are 2 substances; separated by a barrier when the barrier opens up the substance of higher concentration flows into area of lower concentration producing a concentration gradient. Afte(cid:396) (cid:271)oth su(cid:271)sta(cid:374)(cid:272)es (cid:272)a(cid:374) (cid:271)e see(cid:374) o(cid:374) (cid:271)oth sides of the (cid:271)a(cid:396)(cid:396)ie(cid:396)s. Example: c2f4 diffuses through a porous barrier at 4. 6 x 10-6 mol h-1. Pv = nrt only works at low p (<1 atm) and high t (> 0 celsius) Liquefaction of gases competition between kinetic energy of molecules and attractive forces. Decrease t molecules are slower attractive forces dominate gas liquefies increase pressure molecules are closer attractive forces dominate gas liquefies. Liquefaction of polar gases strong attractive forces easier liquefaction liquefaction at higher temperatures.