Consider the generic reaction: A (g) → 2 B (g) + C (g) . If a flask initially contains only A and the reaction proceeds to completion with a final pressure of 38.9 atm , what is the partial pressure of B in the container? (Assume constant volume and temperature.)

Answer : The partial pressure of B in the container is, 25.94 atm

Explanation : Given,

Total pressure = 38.9 atm

The given chemical reaction is:

Initial pressure     p           0        0

At eqm.                 0            2p      p

The total pressure expression will be:

Total pressure = 2p + p

38.9 atm = 2p + p

38.9 atm = 3p

p = 12.97 atm

Now we have to calculate the partial pressure of B in the container.

The partial pressure of B in the container = 2p = 2(12.97) = 25.94 atm

Thus, the partial pressure of B in the container is, 25.94 atm

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