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# What is the half-life of a first-order reaction if it takes 4.8 ´ 10-3 seconds for the concentration to decrease from 1.33 m to 0.51 m?

What is the half-life of a first-order reaction if it takes 4.8 ´ 10-3 seconds for the concentration to decrease from 1.33 m to 0.51 m?