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Question

A mixture of 3 moles of SO2, 4 moles of NO2 and 4 moles of NO is placed in a 2.0L vessel.
SO2(g)+NO2(g)SO3(g)+NO(g).
At equilibrium, the vessel is found to contain 1 mole of SO2. Calculate the value of Kc.

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Solution

Reaction:
SO2(g)+NO2(g)SO3(g)+NO(g)

Initial Moles 3 4 0 4
At equilibrium 3-2=1 4-2=2 2 4+2=6

So, Kc=[SO3][NO][SO2][NO2]=2×61×2=6

The correct answer is 6

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