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When two cotton plugs, one moistened wit...

When two cotton plugs, one moistened with ammonia and the other with hydrochloric acid, are sumulataneously inserted into opposite ends of a glass tube 87.0 cm long, a white ring of `NH_(4)Cl` forms where gaseous `NH_(3)` and gaseous HCl first come into contact.
`NH_(3)(g)+HCl(g)rarrNH_(4)Cl(s)`
At what distance from the ammonis-moistened plug does this occur?

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