Problem: The gas arsine, AsH3, decomposes as follows:2AsH3(g) ⇌ 2As(s) + 3H2(g)In an experiment at a certain temperature, pure AsH 3(g) was placed in an empty, rigid, sealed flask at a pressure of 392.0 torr. After 48 hours the pressure in the flask was observed to be constant at 488.0 torr.b. Calculate Kp for this reaction.

FREE Expert Solution

We are asked to calculate Kp for this reaction.

2AsH3(g) ⇌ 2As(s) + 3H2(g)


Step 1. Convert the pressures to atm

392.0 torr × 1 atm760 torr = 0.516 atm488.0 torr × 1 atm760 torr = 0.642 atm


Step 2. Calculate x 



Total pressure: 

PT = PAsH3 +  PH20.642 atm = 0.516 atm-2x+  3x0.642 atm- 0.516 atm = xx = 0.126 atm


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Problem Details

The gas arsine, AsH3, decomposes as follows:

2AsH3(g) ⇌ 2As(s) + 3H2(g)

In an experiment at a certain temperature, pure AsH 3(g) was placed in an empty, rigid, sealed flask at a pressure of 392.0 torr. After 48 hours the pressure in the flask was observed to be constant at 488.0 torr.

b. Calculate Kp for this reaction.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.