Winter Final 2014 Question 5A

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Jaspreet_Nagra_2I
Posts: 13
Joined: Sat Jul 09, 2016 3:00 am

Winter Final 2014 Question 5A

Postby Jaspreet_Nagra_2I » Sat Mar 18, 2017 2:57 am

In regards to the question:
With respect to [C3H6O], determine the order of the reaction and calculate its rate constant by making three separate plots. Be sure to label the vertical axes along with title to indicate whether the plot is to test for 0th, 1st, or 2nd order. Add umbers to the y-axis.

.... What were the explicit steps taken in finding the rate constant with the information?

Jessica_Kim_3I
Posts: 12
Joined: Sat Jul 09, 2016 3:00 am

Re: Winter Final 2014 Question 5A

Postby Jessica_Kim_3I » Sat Mar 18, 2017 9:20 am

I didn't really use an equation but since we know the 1st order graphs (ln[A] vs time) has a slope of -k I just found k. I solved for (change of ln[A])/(change of time). This gave me (-.63-.19)/(5000-0) which equals -1.64*10^-4. This means k=1.64*10^-4. To me that was the easiest way to solve for k.

You could've also solved for k using [A]t=[A]0*e^-kt using the values in the table. I used [A]t=.532 and [A]initial =1.21 and t=5000 s. This gave me k=1.64*10^-4 1/s. I think the answer differs from the answer key slightly because of rounding.


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