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

At room temperature, ammonia gas at `1 atm` pressure and hydrogen chloride gas at `P atm` pressure are allowed to effuse through identical pin holes from opposite ends of a glass tube of `1 m` length and of uniform cross- section. Ammonium chloride is first formed at a distance of `60 cm` from the end through which `HCl` gas is sent in. What is the value of `P`?

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According to graham's law of diffusion for gases at different pressure
`(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_(HCl)=((60)/(40))xxsqrt((36.5)/(17))=1.5xx1.465=2.198atm`
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