A first-order reaction has a rate constant of 0.547 min - 1. How long will it take a reactant concentration 0.14 M to decrease to 0.07 M?

Not sure how to do this!

3 answers

k = 0.693/t_1/2
Solve for k and substitute into the below equation.

Then ln(No/N) = kt
No = 0.14
N = 0.07
although you should be able to do this in your head with no equations.

So the answer is 0.693

Wrong, the answer is 1.267

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