Total Frustration Radioactive Decay Need Fast Help

AI Thread Summary
The user expresses frustration with a radioactive decay exercise, seeking assistance with their answers. They provide a link to the exercise and list their responses, noting uncertainty about the seventh answer. Despite their calculations suggesting 3775, they find the correct answer is actually 4200. The discussion highlights the challenges faced in solving radioactive decay problems and the need for clarification on the calculations involved.
PremedBeauty
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Total Frustration!Radioactive Decay!Need Fast Help!

Hello,

I have the link to the excercise:
http://www.sciencecourseware.org/VirtualDating/files/RC_6.php"

Here are my answers:

1. 1200
2. 2100
3.3800
4.14500
5.1125
6. 2050
7. ?

I would think (7) would be 3775, but it's not. I have been trying this for hours and cannot figure this out, please help. My head hurts...
 
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I got 4175 BP.
 
It's 4200
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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