equilibrium mixture

An equilibrium mixture at 225 degrees Celsius contains

8.0 x 10^-2 M NH3 and 0.21 M H2 for the reaction 3H2(g) + N2(g) = 2NH3(g)

If the Kc at this temperature is 1.7 x 10^2, what is the equilibrium concentration of N2?

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