The OH Radical Disproportionates According to the Elementary Chemical Reaction

question 2

Multiple Choice

The OH radical disproportionates according to the elementary chemical reaction OH + OH  H₂O + O. This reaction is second order in OH. The rate constant for the reaction is 2.2  10^-12 cm³/molecule • s at room temperature. If the initial OH concentration is 1.8  10¹³ molecules/cm³, what is the first half-life for the reaction?

• A) 3.2  10¹¹ s
• B) 0.025 s
• C) 4.1  10²⁴ s
• D) 3.7 s
• E) 5.1 s

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