lalamonique310 lalamonique310

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 :

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

Otras preguntas

What is the area for this triangle?

Need help don’t understand

At the airport, ten people are waiting on standby. Two seats become available, one first class and one coach. How many ways are there to fill the two seats? 10

How did the Ottoman Empire, China, and Russia deal with the industrial revolution? How did industrialization in these places differ from industrialization in Gr

The area of a rectangular room is 120 square feet. The width is 10 feet. What is the length?

Ww2 Im the Soviet Union, with focus on Leningrad, Stalingrad, and Moscow

What was significant about Thurgood Marshall's appointment to the Supreme Court? He gave the Supreme Court enough votes to approve civil rights laws. He had nev

It seems that almost everyone loves music. The website called Music Quest is very popular with the students at River Bluff Elementary School. The site teaches

y = |x| translated half a unit downward Answer:

Write an equation of each line that passes through the following points in slope-intercept form: M (5, 5) and N (–10, –19)Help me Please!!!!!