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For the exothermic reaction:
$$4 NH_3(g) + 7 O_2(g) ⇄ 4 NO_2(g) + 6 H_2O(g)$$
...which of the following changes will INCREASE the quantity of water vapor in the mixture?
Adding nitrogen dioxide gas.
Heating the reaction.
Decreasing the volume of the reaction vessel.
Adding an inert gas.