Question

potassium-42 has a half life of 12,4 hours. How much of an 848 g sample of potassium-24 will be left after 62.0 hours?

Answer 1

62 hours is how many half-lives?

Answer 2

CAN YOU SHOW ME HOW YOU GOT THAT ANSWER?

Answer 3

i didn't post any answers, i asked you how many half lives have passed in the question.

Answer 4

62.0

Answer 5

thats given in the question


"potassium-42 has a half life of 12,4 hours. How much of an 848 g sample of potassium-24 will be left after \(\Huge\color{red}{62.0 \;hours}\)?"

Answer 6

yes that is the given question

Answer 7

so i repeat, 62 hours is how many half-lives?

Answer 8

yes

Answer 9

are you reading what I'm asking?

how many half-lives have passed after 62 hours?

Answer 10

You have 5 half-lives because 62/12.4= 5. Then you have to divide 848 g by 2 for 5 times... So let's do this out.

First time: 848/2 = 424
Second: 424/2= 212
Third: 212/2= 106
Fourth: 53
Fifth: 26.5

Therefore, I believe your answer should be 26.5g of potassium-24