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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?

A

B

Heating the reaction.

C

Decreasing the volume of the reaction vessel.

D