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

comparing advantages and disadvantages of the civil war stations 1-13. after completing the table of advantages and disadvantages for each side, write a short r

In cultures where work gets done because of the relationship _____. Select one: a. the priority is on accomplishing the task. b. business meetings tend to be qu

answer??? please answer

What group members are free to choose whether or not to be part of a group

Factorizie completely 2ap+aq-bq-2bp

Classify each triangle as right triangle or not right triangle

Mischief Campbell math class lasts 45 minutes. Math class starts at 9:05. what time does math class end?

As a good rule of thumb, you should take a 15-minute break every _____ while driving.

Help me please :(((((

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