HW Prolem (4G.4) 7th Edition

[Helen Mejia 1I]

Can someone explain how to identify which of BF₃ or COF₂ will have a higher molar entropy?

[Xuan Kuang 2L]

COF2 would have a higher molar entropy than BF3.

When you take a look at the molecular structures, BF3 is a trigonal planar with the same B-F bond on each end. This means that is it very ordered, compared to COF2, which has two F's and an O at the ends. This means that for some molecules, it could possibly have an F or an O at a specific end, so it is less ordered because not every end is identical. Thus, COF2 has a higher molar entropy.

[Laura Gong 3H]

COF2 has greater molecular complexity compared to BF3 which means it has a greater number of possible positions/orientations which makes its entropy greater than BF3 which has lesser number of possible positions.