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				   the rate of change of pressure (p) of a gas at constant temp and constant external pressure due to effusion of gas from a vessel of constant volume is related to rate of change of no. of molecules present by:

where k is boltzmann constant.T=temp,V=vol. of vessel and N=no. of moles and dn/dt= -pA/ sq. root of (2pmT) , where A = area of orifice and m= mass of molecule

time reqd for pressure inside vessel to reduce to 1/e of its initial value is (ln e=1):

6 years ago


Answers : (1)


Dear student,

Use graham's law of diffusion,

The comparative rates of diffusion of two gases are inversely proportional to the square root of their      densities.

5 years ago

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