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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`?

Text Solution

Verified by Experts

In this problem the pressure under which the two gases are diffusing are different.
`(r_(NH_(3)))/(r_(HCl)) = sqrt((M_(HCl))/(M_(NH_(3)))) xx (p_(NH_(3)))/(p_(HCl)) = (40)/(60)`
or `sqrt((36.5)/(17)) xx (1)/(p_(HCl)) = (40)/(60)`
`p_(HCl) = 2.198` atm.
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