MCAT General Chemistry Question 279: Answer and Explanation

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Question: 279

5. Considering Step 1 in isolation, if a known amount of O₂NNH₂ is dissolved in water, which of the following plays a role in determining how fast the reaction reaches equilibrium?

A. The pH of the solution
B. The reaction temperature
C. The magnitude of the equilibrium constant
D. The stability of O₂NNH₂ compared to O₂NNH^--and H⁺

Correct Answer: B

Explanation:

B The question requires an answer related to the kinetics of the reaction. Choices A, C, and D are not kinetic factors. The temperature of a reaction is factored into the rate constant (k = Ae⁽^-^Ea/RT⁾), so it will play a role in determining the speed of progress to equilibrium.

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