The rate constant for this first‑order reaction is 0.0210 s−1 at 400 ∘C. A⟶products After how many seconds will 22.9% of the reactant remain?

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The rate constant for this first‑order reaction is 0.0210 s−1 at 400 ∘C.

A⟶products

After how many seconds will 22.9% of the reactant remain?

Expert Solution
Step 1

To Solve this problem we will use the formula of 1st order reaction . 

Which is 

 K = 2.303( log[A]/[A])/t 

Where , K = rate constant 

              t = time 

              [A] = initial Concentration 

              [A] = concentration at time t  

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