It Takes 42 $\circ$ C How Long Will It Take for the Reaction to in a First-Order

question 94

Multiple Choice

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25 ^$\circ$ C. How long will it take for the reaction to be 90% complete

• A) 13.0 min
• B) 86.0 min
• C) 137 min
• D) 222 min
• E) 284 min

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