numerical Through the two ends of glass-tube of lenght 2 meters, hydrogen chloride and ammonia gases are allowed to enter. At what distance ammonium chloride will first appear?

81cm is the answer.

Explanation:

Let X be the length from the HCl end, and therefore, (2-x) from the other end.

For X length, rate of diffusion is :

dx/dt=P A/(Square root of 36.5T

d(2−x)/dt=PA/(square root of 17 T

Dividing both we get;

X/(2−x)= square root of 36.5/17

X=2/2.466=0.81 or81cm

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