Isomers are molecules that have the same chemical formula but different arrangements of atoms, as shown here for two isomers of pentane, C₅H₁₂.

(b) Which isomer do you expect to have the higher standard molar entropy? Explain.

Video transcript

Welcome back everyone in this example. We're told that molecules with different arrangements but the same chemical formula are called summers for the two. I have no names shown below which has the higher standard molar entropy and why? So we're going to recognize that for a structure to we have what is almost a spherical molecule compared to structure one which has less complicated branching here. So because we have this more complicated branching in our structure of two of no name instructor to of no name. Sorry, we would recognize that we have less emotional energy Compared to ice swimmer one and this is due to its structure of more complex branching. This means that we will also have less vibrational motion associated with the second I summer of noting. And so this means that structure one of no name is going to have because of its less complicated molecular structure due to less branching Structure one will have a higher standard molar entropy because it has greater emotional energy than I simmer to. So our final answer is going to be Structure one which has a higher standard molar entropy because it has greater emotional energy due to its less complicated branching than I summer too. I hope everything I reviewed was clear. If you have any questions leave them down below and I will see everyone in the next practice video