chemistry

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I am given the following reaction:
2NH3(g) -------> N2(g) + 3H2(g)

My question is:
6.4 mols of ammonia gas has been put into a 1.7 L flask and has been permitted to reach equilibrium in accordance to the reaction listed above. If the equilibrium mixture has 4.2 mols of nitrogen, what is the value of the equilibrium constant supposed to be?

Thank you

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