For the Second-Order Reaction Below,the Rate Constant of the Reaction $2 \mathrm{~A} \rightarrow \mathrm{B} \quad\quad\quad\quad\quad \text { rate }=k[\mathrm{~A}]^{2}$

question 5

Multiple Choice

For the second-order reaction below,the rate constant of the reaction is 9.4 × 10^-3 M^-1s^-1.How much time (in seconds) is required to decrease the concentration of A from 2.16 M to 0.40 M? $2 \mathrm{~A} \rightarrow \mathrm{B} \quad\quad\quad\quad\quad \text { rate }=k[\mathrm{~A}]^{2}$

• A) 2.0 × 10¹ s
• B) 7.8 × 10¹ s
• C) 1.8 × 10² s
• D) 1.9 × 10² s
• E) 2.2 × 10² s

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