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When two cotton plugs, one moistened with ammonia and the other with hydrochloric acid, are simultaneously...

When two cotton plugs, one moistened with ammonia and the other with hydrochloric acid, are simultaneously inserted into opposite ends of a glass tube that is 87.0 cm long, a white ring of NH4Cl forms where gaseous NH3 and gaseous HCl first come into contact.

NH3(g) + HCl(g) ⟶ NH4Cl(s)

How long did it take for the gases to come into contact if ammonia gas traveled 51.7 cm to the point of contact?

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