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Question:

A vessel of one litre capacity containing 1 mole of SO3 is heated till a state of equilibrium is attained. 2SO3(g)⇌2SO2(g)+O2(g) At equilibrium, 0.6 moles of SO2 had formed. The value of equilibrium constant is:

0.18

0.36

0.45

0.68

Solution:

2SO3(g)⇌2SO2(g)+O2(g)
Initial conc. 1.0 mole 0.0 mole 0.0 mole
Equilibrium 0.4 mole 0.6 mole 0.3 mole
⇒Equilibrium constant is given by
K=[SO2]2[O2]/[SO3]2=(0.6)2(0.3)/(0.4)2=0.675=0.68
Hence, the correct option is D