### Problem 15.61

Posted:

**Sun Mar 11, 2018 11:31 pm**Where did the solution manual get the equation ln(k'/k)=Ea/r(1/T-1/T') from?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=151&t=29475

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Posted: **Sun Mar 11, 2018 11:31 pm**

Where did the solution manual get the equation ln(k'/k)=Ea/r(1/T-1/T') from?

Posted: **Mon Mar 12, 2018 12:22 am**

I believe this equation was derived from the equation on the constants and equations sheet: k=A exp(-Ea/RT), where ln(k'/k) was used because of the reaction being first order and T being extracted from (-Ea/RT) to become Ea/r(1/T - 1/T'). I'm not entirely sure about this, but I hope this helps.

Posted: **Mon Mar 12, 2018 2:04 pm**

Do you know where A went though?

Posted: **Mon Mar 12, 2018 6:47 pm**

I am also confused about where this equation came from can anyone elaborate on this more?

Posted: **Mon Mar 12, 2018 10:10 pm**

Does anyone know why they used kilojoules in this problem? When i use regular joules (R= 8.314 J/Kxmol) I get a completely different answer.

Posted: **Tue Mar 13, 2018 12:51 am**

I calculated using joules and had my answer off by a factor of 10^{3} which is reasonable because converting to kilojoules would provide me with the same answer as the solution manual. Perhaps there was some miscalculation in the process?