A Certain First-Order Reaction A $\rarr$ B Is 25% Complete in 42 Min at 25°C

question 128

Multiple Choice

A certain first-order reaction A $\rarr$ B is 25% complete in 42 min at 25°C.What is the half-life of the reaction?

• A)21 min
• B)42 min
• C)84 min
• D)20 min
• E)101 min

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