Graham ’ s Law. Rate of Diffusion and Effusion. Introduction. When we first open a container of ammonia, it takes time for the odor to travel from the container to all parts of a room. This shows the motion of gases through other gases.
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A sample of helium, He, effuses through a porous container 6.04 times faster than does unknown gas A. What is the molar mass of the unknown gas?
MHe = 4.00 g/mol
rateHe = 6.04
MA = A g/mol
rateA = 1.00
= 146 g/mol