In a gaseous reaction between ammonia and hydrochloric acid (HCl), a white preci

Question

In a gaseous reaction between ammonia and hydrochloric acid (HCl), a white precipitate of ammonium chloride is produced according to the following reaction. NH3 (g) + HCl (g) = NH4Cl (s) Two cotton plugs soaked in ammonia and hydrochloric acid are placed simultaneously at opposite ends of a hollow glass tube 3.50 m long, the gas evaporates and the two gases diffuse towards each other.

a. How far from the ammonia end will the white precipitate of ammonium chloride form? Assume constant, equal evaporation rates.

Answer in meters

Explanation / Answer

Since CH4 diffuses 2.86 times faster than Xe, it will also travel

2.86 times farther than Xe in the same amount of time. To find

where they will meet, we can call x the distance Xe travels in one

unit of time, and 2.86x the distance CH4 travels in the same unit of

time. The total distance must be equal to the length of the tube, so

we can write the following equation.

x + 2.86x = 5.00

Solving for x gives 1.30 m. The gases will meet 1.30 m from the

Xe end.

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