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Increasing N2 will result in a larger denominator for the Qp equation, resulting in a smaller value for Qp. When Qp is less than Kp, the reaction moves forward, meaning that more NH3 will be created from N2 and H2, resulting in H2 concentration decreasing.
When you increase the amount of N2 in a system, the amount of H2 doesn't change. Since there is a sudden injection of H2 in the system at equilibrium, the reaction will want to start favoring the product (NH3). Therefore, both N2 and H2 are getting consumed and H2 concentration decreases relative to the original equilibrium concentration. (However, K does not change, the ratio of molarities is the same, but the actual molarity of H2 decreases)
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