At a certain temperature, 0.660 mol of SO3 is placed in a 3.00-L container

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At a certain temperature, 0.660 mol of SO3 is placed in a 3.00-L container.

2SO3(g) <—> 2SO2 + O2(g)

At equilibrium, 0.160 mol of O2 is present. Calculate Kc.