Question

from this graph How much nitrogen-14 will be produced from a 200-g sample of carbon-14 after 17,190 years?

Answer 1

how many half lifes is that?

Answer 2

I am still reading these half lifes in book so confused

Answer 3

3 half lifes meaning there will be an 8th of the atoms left, can you go from mass to atoms?

Answer 4

I just got that as you did

Answer 5

No i would calculate the atoms total and then divide them by 3/4 and those would be the ones that are N

Answer 6

now ^

Answer 7

I'm sorry I just don't understand with the 200 gram sample

Answer 8

do you know how to go from mass-->moles-->atoms?

Answer 9

i have done it before but would have to go back into book to reread again

Answer 10

\[200g(\frac{1 mole c}{12.01g c})\frac{6.022x10^23 c atom}{1 mole c})\]

that will get you atoms,

Answer 11

oh my

Answer 12

Does that look like anything you have ever done?

Answer 13

yes

Answer 14

not that complex

Answer 15

1.00x10^25 is the total (I think i'm using a jankie calculator) now just multiply that number by .875 and that will be the number of nitrogen

Answer 16

zbay thank you I guess some people just don't understand that it just doesn't click for me. Another guy was very mean like I am some dumbass.

Answer 17

No chemistry is a ball buster, it takes a lot of practice and everything builds on previous knowledge. If you keep pluging away at it i'm sure you will get a handle on this subject. Good luck and keep asking questions!

Answer 18

in 3 half-lifes, 200g carbon-14 will decay to 100-50-25g,
so taking that carbon-14 decays to nitrogen-14, 175 g is produced

or using the half-life formula,
amount of nitrogen-14 produced = 200 - 200*0.5^(17190/5730)
= 175 g

Answer 19

Thats a much easier way to do it, It can be calculated the way i explained it sorry if i added to the confusion