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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 one metre 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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The correct Answer is:
( 2.20 atm )
Rate of effusion `(r ) prop (p)/(sqrtM)`
`rArr (r(NH_(3)))/(r (HCl)) = (1)/(sqrt17) xx (sqrt(36.5))/(P) rArr (40)/(60) = (1)/(P) sqrt((36.5)/(17)) rArr p = (3)/(2) sqrt((36.5)/(17)) = 2.20` atm
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