the half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes has elapsed?

Question

02-01-2018
Chemistry

contestada

the half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes has elapsed?

Respuesta :

Otras preguntas

what do this mean explain the following thoughts of annemarie, "it was hard for the ones who were waiting, Annemarie knew. Less dangerous perhaps but more fear

algae do not cause disease or not

in a geometric series t1=23,t3=92 and the sum of all of the terms of the series is 62813. How many terms are in the series

which state capital is north of 40 degrees north latitude: Frankfort, denver, salt lake city, or columbus?

The traits of populations in the forest ecosystem have changed over time. What caused the traits to change?

write the equation in function form.then graph the equation y-x=-1

write the equation in function form then graph it 5x-2y=6 thx to the ppl who help

Write down a sensible metric unit for measuring A) the distance from London to Paris B) the amount of water in a swimming pool

The traits of populations in the forest ecosystem have changed over time. What caused the traits to change?

JoannaBlackwelder JoannaBlackwelder · Answer 1 · 2018-01-02T19:53:18+01:00

JoannaBlackwelder JoannaBlackwelder

02-01-2018

7.2 minutes is exactly 3 half-lives (3*2.4 = 7.2). For each half-life, we divide the amount we have by 2.
1st half-life = 100.0/2 = 50.00 g
2nd half-life = 50.00/2 = 25.00 g
3rd half-life = 25.00/2 = 12.50 g
So we have 12.30 g after 7.2 minutes.

Answer Link