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At room temperature, ammonia gas at 1 at...

At room temperature, ammonia gas at 1 atm pressure and HCl gas at pressure P atm are allowed to effuse through idential pin holes from opposite ends of a glass tube of 1 meter length and of uniform area of cross-section. `NH_(4)Cl` is first formed at a distance of 60 cm from the end through which HCl gas was sent in. Calculate the value of P.

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According to Graham's law of diffusion for gases at different pressures,
`(r_(HCl))/(r_(NH_(3)))=(P_(HCl))/(P_(NH_(3)))sqrt((M_(NH_(3)))/(M_(HCl)))`
`(60)/(40)=(P)/(1)sqrt((17)/(36.5))" or "P=((60)/(40))xxsqrt((36.5)/(17))=1.5xx1.465=2.1989" atm"`
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