A first order reaction takes 69.3 min for 50% completion. Set up on equation for determining the time needed for 80% completion.

Explanation

To solve the problem of determining the time needed for 80% completion of a first-order reaction, we can follow these steps:

### Step 1: Determine the rate constant (k)
Given that the half-life (t₁/₂) of the reaction is 69.3 minutes, we can use the formula for the half-life of a first-order reaction:

\[ t_{1/2} = \frac{0.693}{k} \]
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