Conversion of cyclopropane to propene

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Discussion Overview

The discussion revolves around the conversion of cyclopropane to propene as a first order reaction. Participants are examining the calculation of the rate constant, k, based on given concentrations over a specified time period.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant presents an attempt to calculate the rate constant using the formula ln[A]/[B] = -kt, but arrives at a different value than expected.
  • Another participant questions whether the first participant is correctly applying the formula, suggesting a misunderstanding regarding the concentrations of the compounds involved.
  • A third participant expresses confusion about the equation used, indicating a potential misinterpretation of the problem's requirements.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct application of the formula or the interpretation of the concentrations involved in the reaction.

Contextual Notes

There is uncertainty regarding the correct use of the formula for calculating the rate constant, particularly in relation to the concentrations of cyclopropane and propene.

geffman1
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Homework Statement




We examine the conversion of cyclopropane to propene, a first order process. If we begin with 0.0200 M cyclopropane and find that after 168 s the concentration of propene is 0.00286 M, what is the rate constant, k, at this temperature?



i used the forumula ln[A]/=-kt
=(ln 0.00286/0.02)/168=-k
therefore k=0.0116
however answer is 9.19 x 10-4/s

anyhelp would be good.
thanks
 
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geffman1 said:
We examine the conversion of cyclopropane to propene, a first order process. If we begin with 0.0200 M cyclopropane and find that after 168 s the concentration of propene is 0.00286 M, what is the rate constant, k, at this temperature?

Hi geffman1! :smile:

Aren't you using the formula for 0.0200 M cyclopropane and 0.00286 M cyclopropane? :redface:
 


hey, umm yep? I am confused
 
geffman1 said:
hey, umm yep? I am confused

Perhaps I've misunderstood your equation, but the question gives you the concentration of different compounds, and I think you've used an equation that asumes they're the same compound.
 

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