For the First-Order Reaction Below,the Initial Concentration of a Is $\mathrm{A} \rightarrow \mathrm{B}$

question 2

Multiple Choice

For the first-order reaction below,the initial concentration of A is 0.240 M.If the concentration of A decreases to 0.0800 M after 21.8 hours,what is the half-life of the reaction? $\mathrm{A} \rightarrow \mathrm{B}$$\quad$$\quad$$\quad$$\quad$$\quad$ rate $=k[\mathrm{~A}]$

• A) 0.0504 hrs
• B) 1.28 hrs
• C) 7.26 hrs
• D) 10.4 hrs
• E) 13.8 hrs

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