A first order reaction has a specific reaction rate of . How much time will it take for 20g of the reactant to reduce to 5 g?

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Canvas Classes · Accepted Answer

🧠 The Two-Step Reduction
First-order reactions have a constant half-life. To find the time for a reaction to go from  to , we don't need complex calculus; we just need to see how many "halves" it took to get there.

🗺️ The Half-Life Method
1. The Journey: .
   - Total time taken = .
2. Finding : For a first-order reaction with rate constant :

3. The Total: Time .

⚡ The 30-Second Insight
Reduction from  to  always takes two half-lives (). 
 (approx). 
The exact match in the options is

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