# At 20ºC two balloons of equal volume and porosity are filled to a pressure of 2 atm, one with 14 kg N2 & other with 1 kg H2 . The N2 balloon leaks to a pressure of 1/2 atm in one hour. How long will it take for H2 balloon to leaks to a pressure of 1 atm. ​                                                           2

Dear student,

According to graham's law of diffusion,

$\frac{{r}_{{N}_{2}}}{{r}_{{H}_{2}}}=\frac{{P}_{{N}_{2}}}{{P}_{{H}_{2}}}\left(\frac{{M}_{{H}_{2}}}{{M}_{{N}_{2}}}\right)$
Since pressure drop is same for both,
Putting the values in the above expression will give

Hope this helps,

Regards

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