Explain equilibrium was obtained when some no gas

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Question- The following equilibrium was obtained when some NO gas was placed into a 2.00-L container until the pressure was 0.650 atm:

2NO(g) ? N2(g) + O2(g)

The equilibrium pressure of N2 was found to be 5.25 x 10?2 atm. What is Keq for this reaction?

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