We set the molar masses:
gas A = 1
gas B = 2
Then assign gas B to r1 (and MM1) gas A to r2 (and MM2) since we want to know the effusion rate for the gas that is twice the molar mass of the other.
Then using Graham's Law:"r1 \/ r2 = (MM2 \/ MM1) ^-1\/2"
r1 / 3.6= (1 / 2) ^-1/2
r1 / 3.6 = 0.70710678
r1 = 2.55 mol/min
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