At `20^(@)C` two balloons of equal volume and porosity are filled to a pressure of 2 atm one with `14kgN_(2)` and other with `1kg` of `h_(2)` The `N_(2)` balloon leaks to a pressure of `1//2` atm in 1hr How long will it take for `H_(2)` balloon to reach a pressure of `1//2atm` ? .