# 500 grams of a radioactive material decays for 25 minutes until only 25.2 grams of the isotope remains. Determine its half-life.

1 answer

###### Question:

500 grams of a radioactive material decays for 25 minutes until only 25.2 grams of the

isotope remains. Determine its half-life.

isotope remains. Determine its half-life.

## Answers

Answer:Calculations Using the First Order Rate Equation: r = k[N] Since the rate of radioactive decay is first order we can say: r = k[N]1, where r is a measurement of the rate of decay, k is the first order rate constant for the isotope, and N is the amount of radioisotope at the moment when the rate is measured.

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