The rate of effusion of nitrogen gas, Chemistry

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How can we calculate the rate of effusion of nitrogen gas from a cylinder and How much time it will take??

Ans) rate of effusion=r=(volume of nitrogen gas effusing from the cylinder)/(time taken)

also since pressure and temperature are constant, volume is proprtional to no. of moles

so,r=(no. of moles of N2 effusing)/(time taken)

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