Problem: A 4.0L reaction flask initially contains 4.0 mol of SO3 at 400K. Sulfur dioxide and oxygen form: 2SO3(g) ⇌ 2SO2(g) + O2(g)After equilibrium is established, 0.27 mol SO3 remain. What is the value of Kc?

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A 4.0L reaction flask initially contains 4.0 mol of SO3 at 400K. Sulfur dioxide and oxygen form: 

2SO3(g) ⇌ 2SO2(g) + O2(g)

After equilibrium is established, 0.27 mol SO3 remain. What is the value of Kc?

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