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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: dp/dt=kT*dN/V*dt 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):

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:
dp/dt=kT*dN/V*dt
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):

Grade:11

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

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.

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