An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature by the reaction 3H₂(g) + N₂(g) — 2NH3(g) At equilibrium, the concentrations are [H₂] = 5.0 M, [N₂] = 8.0 'M, and [NH₂] = 4.0 M. What were the concentrations of nitro- gen gas and hydrogen gas that were reacted initially?

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