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Question

XY2 dissociation as-
XY2(g)XY(g)Y(g)
Initial pressure of XY2 is 600 mm Hg
.The total pressure st equilibrium is 800 mm Hg.
Assuming volume of system to remain constant. the value of Kp is:

A
50
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B
100
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C
20
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D
400
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Solution

The correct option is C 100
Initial :At equillibrium :XY2(g)600mm(600p)mmXY(g)0pmm+Y(g)0pmm
Increase in pressure =200 mm of Hg

Total pressure at equillibrium =(600p)+p+p=800 mm of Hg
600+p=800
p=800600=200 mm of Hg
PXY2=600200=400 mm of Hg
PXY=200 mm of Hg
PY=200 mm of Hg

Kp=PXY.PYPXY2
Kp=200×200400=100 mm of Hg

Hence the value of Kp is 100mm of Hg.

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