katelynhessleroxouez katelynhessleroxouez

18-05-2020
Chemistry

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(25 points) A certain isotope of technetium has a half-life of 8 hours. How much of a 40 gram sample will be left after 16 hours?

A. 10 grams
B. 40 grams
C. 5 grams
D. 20 grams

Respuesta :

kiramaemyers kiramaemyers

18-05-2020

Answer:

A) 10 grams

Explanation:

16 hours = 2 half lives

This means that the number is divided in half twice.

40/2 = 20

20/2 = 10

I hope this helps!! :)

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