A thin glass tube one meter long is positioned horizontally along a meter stick

Question

A thin glass tube one meter long is positioned horizontally along a meter stick with the 0.0000 meter marking aligned with the left edge of the glass tube and the 1.0000 meter marking aligned along the right edge of the glass tube. The tube is filled with argon gas at one atmosphere of pressure, and the ends are stoppered with cotton plugs. Hydrogen chloride gas is introduced into the glass tube at the left end of the tube, and ammonia gas simultaneously is introduced into the tube at the right end. At the precise location where the two gases meet, a white ring is formed on the inside of the glass tube.

Of what substance is the white ring composed?

At what distance from the left edge of the tube does the white ring form?

Explanation / Answer

length of glass tube = 1.0000 meter.

according to graham law of diffusion

r1/r2 = ?M2/M1

r1 = rate of diffusion of HCl. = d1/dt

d1 = distance travelled by Hcl in one unit time.

r2 = rate of diffusion of NH3. = d2/dt

d2 = distance travelled by NH3 in one unit time.

d1/d2 = ?M2/M1

d1/d2 = ?17/36.5 = 0.6825

d1/d2 = 0.6825 , d1 = 0.6825*d2

d1+d2 = 1

0.6825*d2 + d2 = 1

d2 = 0.594 = distance travelled by NH3.

d1 = 0.40564 = distance travelled by HCl

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