Carbon cycles through ecosystems. ... To release the energy in food, organisms break down the carbon compounds—a process called respiration. Carbon is released and cycled back into the atmosphere as carbon dioxide. When living things die and decay, the rest of the carbon that makes up living matter is released.
The amount that will remain after 3.7 hours for isotope chlorine that has a half life of 55.5 minutes is 2.813 kg
Explanation
Half life is the time required for the radio activity of a specified isotope to fall to a half its original value.
convert 3.7 hrs into minutes
= 3.7 x 60 = 222 minute
find the number of half life that chlorine isotope undergo in 222 minutes
=222 minutes / 55.5 minutes = 4 half life
therefore 45 kg after first half life =45 kg /2=22 .5 kg
22.5 kg after second half life = 22.5/2 =11.25 kg
11.25 kg after third half life = 11.25/2 = 5.625 kg
5.625 kg after fourth half life = 5.625/2 = 2.813 kg
