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Nitrogen and hydrogen react to form ammonia, like this: N2(g) + 3H2(g)-->2NH3 (g) The reaction is exothermic. Suppose a mixture of N2, H2, and NH3 has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations below will cause in the composition of the vessel. Also decide whether the equilibrium shifts to the right or left. (a) The temperature is lowered. The pressure of H2 will _________________. (b) The temperature is raised. The pressure of NH3 will _________________.