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Given the following reaction: A ( s ) + B ( l ) ⟺ C ( g ) + D ( g ) Δ H ∘ = − 67 k J If the above reactants and products are contained in a closed vessel and the reaction system is at equilibrium, the number of moles of C can be decreased by which of the following? Group of answer choices Decreasing the temperature of the reaction system Adding substance A to the system Removing substance D from the system. Decreasing the volume of the reaction vessel Adding a catalyst to the reaction system