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From the balanced chemical equation, we see that 3 moles of hydrogen gas (H2) react with 1 mole of nitrogen gas (N2) to produce 2 moles of ammonia gas (NH3). Therefore, to completely convert 9.0 moles of hydrogen gas, we need 9.0 moles H2
(1 mole N2 / 3 moles H2) = 3.0 moles of nitrogen gas.