### Relationship between K and G

Posted:

**Thu Mar 15, 2018 5:43 pm**Why is it that when K<1, G is + and when K>1, G is -? I know that this is because of the equation G = -RTlnK, but what does it mean conceptually?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=135&t=29855

Page **1** of **1**

Posted: **Thu Mar 15, 2018 5:43 pm**

Why is it that when K<1, G is + and when K>1, G is -? I know that this is because of the equation G = -RTlnK, but what does it mean conceptually?

Posted: **Thu Mar 15, 2018 10:50 pm**

Why is it that when K<1, G is + and when K>1, G is -? I know that this is because of the equation G = -RTlnK, but what does it mean conceptually?

When K is less than 1, reactants are more favored in the reaction than products. Therefore, G is not spontaneous (positive) because spontaneous forward reactions favor products and occur naturally. So then when K is greater than 1, products are favored and G is spontaneous (negative).

When K is less than 1, reactants are more favored in the reaction than products. Therefore, G is not spontaneous (positive) because spontaneous forward reactions favor products and occur naturally. So then when K is greater than 1, products are favored and G is spontaneous (negative).