## Winter 2013 Midterm #5.B

Michelle_Nguyen_3F
Posts: 40
Joined: Wed Sep 21, 2016 2:59 pm

### Winter 2013 Midterm #5.B

Arrange the following substances in order of increasing standard molar entropy"

$CHF_{3}(g), CF_{4}(g), CH_{3}F(g), CH_{2}F_{2} (g)$. The answer is given as: $CH_{3}F(g) < CH_{2}F_{2} (g) < CHF_{3}(g) < CF_{4}(g)$.

I know that standard molar entropy has to do with the number of possible positions the molecules/atoms can be in. Could someone please explain why this is the correct answer? Thank you!

Manpreet Singh 1N
Posts: 41
Joined: Wed Sep 21, 2016 2:59 pm
Been upvoted: 1 time

### Re: Winter 2013 Midterm #5.B

Hello,

My logic for this problem is that the molecule with the greater molar mass has the greatest molar entropy because the more massive the gas molecule, the more disordered it can be.

Hope that helps :)

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