Last edited by a moderator: May 3, 2017

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Discussion Overview

The discussion revolves around a homework problem related to a second-order reaction, specifically calculating the time required for the concentration of a reactant to decrease from an initial value to a final value. The scope includes mathematical reasoning and homework-related inquiries.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant presents a homework question involving a second-order reaction and asks for help in solving it.
  • Another participant responds with a dismissive comment suggesting the original poster should do their own homework.
  • A different participant criticizes the rude comments and emphasizes the importance of helping others learn.
  • Further responses reiterate that assistance is not provided without evidence of effort from the original poster.
  • One participant expresses frustration at not knowing how to start the problem and indicates a desire to seek help elsewhere.
  • Another participant suggests referring to the forum rules and provides guidance on what information is needed to solve the problem, including the relevant equation for a second-order reaction.

Areas of Agreement / Disagreement

There is no consensus on how to approach the homework question, with some participants insisting on the need for the original poster to demonstrate prior effort, while others express a desire for a more supportive environment. The discussion remains unresolved regarding the provision of help.

Contextual Notes

Participants have not provided specific mathematical steps or shown any work related to the problem, which may limit the ability to assist effectively.

kittymaniac84
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A reaction of the form aA = products is second order with a rate constant of 0.169
L/(mol s). If the initial concentration of A is 0.159 mol/L, how many seconds would it
take for the concentration of A to decrease to 6.07 x 10^-3 mol/L ?

how to solve these
 
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do your own hw
 
If your not going to help, don't bother to post any rude comments. That is not how you help someone learn.
 
kittymaniac84 said:
If your not going to help, don't bother to post any rude comments. That is not how you help someone learn.

NO that is what the HOMEWORK forum is for. And no one is going to help you there either because you haven't even shown that you have tried any work on your own.
 
I don't know how to attempt this. I will find other places who can help.
 
gravenewworld said:
do your own hw
Ok jackass. Next time, just refer them to the Forum rules.

FAQ: Why hasn't anybody answered my question? - https://www.physicsforums.com/showthread.php?t=94384

Anyways Kitty ...

1) What is the equation you will need for a 2nd order reaction?
2) What values do you have? Initial/Final concentration ... etc?

Refer to the image for equations:

http://alt1.mathlinks.ro/Forum/latexrender/pictures/1/b/a/1bacaba62a260d46b7600cc644b6bba500f54b3b.gif
 
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