Asked by Andrea

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!

Answers

Answered by DrBob222
k = 0.693/t<sub>1/2</sub>
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.
Answered by Anonymous
So the answer is 0.693
Answered by Anonymous
Wrong, the answer is 1.267
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