Final answer:
To determine the direction in which a reaction proceeds to reach equilibrium, compare the reaction quotient Q with the equilibrium constant K; this allows prediction of whether the forward or reverse reaction is favored.
Step-by-step explanation:
The question pertains to chemical equilibrium and involves determining the direction in which a reaction proceeds as it approaches equilibrium. To answer this, we compare the reaction quotient Q with the equilibrium constant K. If Q < K, the reaction will proceed in the forward direction to produce more products until equilibrium is reached. Conversely, if Q > K, the reaction will shift in the reverse direction to produce more reactants. By examining the concentrations of reactants and products at various points during the reaction and calculating Q, we can predict the direction of the reaction in each of the given experiments.