When the initial pressure of XY2 is 600 mm Hg, the total equilibrium pressure is 800 mm Hg. Calculate K for the reaction assuming that the volume of the system remains unchanged.
50
166.6
100
400
A
50
B
166.6
C
100
D
400
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Solution
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XY2(g)⇌XY(g)+Y(g)
The initial pressure of XY2 is 600 mm Hg.
Let x mm Hg be the change in pressure of XY2 to reach equilibrium.
The equilibrium pressures of XY2, XY and Y are (600−x) mm Hg, x mm Hg and x mm Hg respectively.
Total pressure at equilibrium =(600−x)+x+x=600+x mm Hg. But it is equal to 800 mm Hg.
(600+x)=800
x=200 mm Hg
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