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A certain first-order reaction ( A --> B) is 25% complete in 42 min at 25oC. What is its rate constant

User Hexium
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The rate constant for this first-order reaction is 0.0350/min, and the reaction is 25% complete in 42 minutes at 25°C. This is because after 42 minutes, 25% of the amount of A has reacted, so the rate constant (which is the speed of the reaction) is 0.0350/min.
User Kiswa
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