Rates, whats wrong with my working?

  • Thread starter geffman1
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In summary, the conversation discusses the conversion of cyclopropane to propene and finding the rate constant, k, at a specific temperature. The working formula used is In[A]-In[A]=-kt, which results in a answer of 0.011576 mol/(L x s). However, the correct answer given in the exercise is 9.19x10-4/s, which may be a mistake in the answer key. The person also asks for verification and mentions the possibility of using the wrong formula.
  • #1
geffman1
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hey guys I've got a question.

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?

My working:
In[A]-In[A]=-kt
(In0.00286-In0.0200)/168=-k
therefor k=0.011576 however correct answer is 9.19x10-4

anyhelp would be good. thanks
 
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  • #2
Hello there,

I get the same answer in mol/(L x s) as you. Could you verify that the correct answer is given in the same units?

Thanks.
 
  • #3
C. 9.19 x 10-4/s here's the answer out exercise, maybe they just made a mistake, are we using the right formula? thanks for the reply
 
  • #4
You're welcome.

Unfortunately, I still have not found a different answer. Is this textbook a recognised, leading one in chemistry? If not, then the answer key may be erroneous.
 

FAQ: Rates, whats wrong with my working?

What are rates and why are they important in my work?

Rates refer to the speed or frequency at which a certain process or action occurs. In scientific research, rates are crucial because they provide a measure of efficiency and effectiveness. They allow us to compare different methods and determine the most optimal approach for a particular task.

How can I calculate rates in my experiments?

To calculate rates, you need to measure the amount of change in a given variable over a specific unit of time. For example, if you are studying the growth of bacteria in a culture, you would measure the increase in population over a set time period. Then, you can divide the change in population by the time interval to get the rate of growth.

What factors can affect rates in my experiments?

There are several factors that can influence rates in scientific experiments. These include temperature, pressure, concentration, and the presence of catalysts or inhibitors. It's important to control these variables in order to accurately measure and compare rates.

How do I know if the rates in my experiment are accurate?

The accuracy of rates in an experiment can be determined by conducting multiple trials and calculating the average rate. It's also important to have a control group to compare your results to. If the rates in your experiment are consistent and align with your hypothesis, they can be considered accurate.

What are some potential sources of error in rate calculations?

There are several sources of error that can affect rate calculations, such as human error in measurement, equipment malfunctions, and external factors like changes in temperature or contamination. It's important to identify and minimize these sources of error to obtain reliable and accurate rate data.

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