You react some osmium with pure oxygen to produce osmium tetroxide. The vessel now contains pure OsO4, some leftover oxygen, and nothing else. You add more oxygen without changing T or P. The reaction should…
A. …go backwards.
B. …go forwards.
C. …stop.
D. …not restart.
E. …oscillate about a mean.
A. Incorrect. By adding more of a reactant the reaction should try to consume more of the reactant.
B. Incorrect. While this is what Le Chatelier’s principle states, there is no osmium left to react.
C. Incorrect. The reaction had already stopped for lack of the limiting reactant (Os).
D. Correct. If there was excess osmium, this could provoke further reaction to develop more product. Since there is none, the already stopped reaction should not restart.
E. Incorrect. This statement is meaningless in this context.
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