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### ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)

Posted: **Mon Feb 25, 2019 11:51 pm**

by **Emmaraf 1K**

We learned this equation in class but to calculate K when not at 25 degrees C yet it's not on our formula sheet. Will it be on the test and if so how would it show up/would we have to memorize it?

### Re: ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)

Posted: **Tue Feb 26, 2019 12:02 am**

by **Shubham Rai 2C**

This is a derived equation from the formula of delta G (standard) = -RTlnK where you solve for K for two different T value. You have to combine the two different T equations to find the equation ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1). So technically it is on the equation sheet, but you can memorize it to not have to go through these steps.

### Re: ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)

Posted: **Tue Feb 26, 2019 4:41 pm**

by **Jonny Schindler 1A**

Can anyone provide an example of using this equation?

### Re: ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)

Posted: **Tue Feb 26, 2019 4:43 pm**

by **Selina Bellin 2B**

memorize it and understand where it comes from, but i believe it's also on the test's formula page