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Q.

In the reaction \large 2S{O_{3\left( g \right)\,}},\, \rightleftharpoons \,2S{O_{2\left( g \right)}}\, + \,{O_{2\left( g \right)}},\,\,S{O_{3\left( g \right)}} is 50% dissociated at 270C when the equilibrium pressure is 0.5 atm. Partial pressure of SO3(g) at Equilibrium is

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a

0.5 atm

b

0.3 atm

c

0.2 atm

d

0.1 atm

answer is C.

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Detailed Solution

 2 SO3(g)2SO2(g) + O2(g)
Initial moles1 0                 0
Moles at equilibrium1-0.5=0.5 0.5             0.25

Total moles at equilibrium =0.5 +0.5 0.25 = 1.25

Partial pressure of SO3 at equilibrium = χSO3×P = 0.51.25×0.5 =0.2 atm

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In the reaction  is 50% dissociated at 270C when the equilibrium pressure is 0.5 atm. Partial pressure of SO3(g) at Equilibrium is