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A radioactive isotope of potassium has a half-life of 20 minutes if a 40 g sample of this isotope is allowed to decay for 80 minutes how many grams of the r
adioactive isotope will remain

Respuesta :

brow4975

There will be 2.5g left.


Explanation:

80/20 = 4 half lives

40/2 = 20

20/2 = 10

10/2=5

5/2 = 2.5


Answer:

It's 2.5 mates

Explanation:

Jut did it on USATestPrep

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