For the reaction 3H2(g) + N2(g) <=====> 2NH3(g) at 472°C equilibrium is established when [H2] =0.0200M, [N2] = 0.0100M and [NH3] = 5.37 × 10–8M. What is the equilibrium constant for the reverse reaction?       3.72 × 103   2.77 × 107   1.39 × 109   6.94 × 1010

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