Ascientist digs up sample of arctic ice that is 458,000 years old. he takes it to his lab and finds that it contains 1.675 grams of krypton-81.

if the half-life of krypton-81 is 229,000 years, how much krypton-81 was present when the ice first formed?

use the formula n = n0 .

6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

where

here

t =  458,000 years

= 229,000

= \

n = = 2.000

Now substituting the values

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

answer; protein;