under similar conditions which of the following gas will diffuse 4 times as quickly as O2 ?
(a)Helium , (b)H2 , (c)N2 , (d)Cl2 . and how?
 
 

According to Graham's Law, diffusion of a gas is inversely proportional to the square root of the molar mass of the gas:
RateHeRateO2=MO2MHe=324=22
RateH2RateO2=MO2MH2=322=4
RateN2RateO2=MO2MN2=3228
RateCl2RateO2=MO2MCl2=3234
Rate of diffusion of hydrogen is 4 times the rate of diffusion of oxygen.
The correct answer is (b).
 

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