Molecular weight determination from freezing point depression


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> 1. Which is the better solvent for molar mass determinations by freezing point depression, benzene or cyclohexane?
> 2. Which is the better method for molar mass determination, freezing point depression or boiling point elevation?
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What is the correct approach for solving these?


1. In my opinion, resonance structures might be the key concept, but I don't know how it would help or hurt.
2. I think boiling has a decomposing effect that we must avoid, meaning freezing the compound(s) is preferable.


But, both of these statements are inadequate.





```
Molar freezing point depression  
Benzene      5.12 °C/m  
Cyclohexane  20.0 °C/m  

Molar boiling point elevation  
Benzene      2.53 °C/m  
Cyclohexane  2.79 °C/m  

```

I would base my argument on the constants, instead of waving hands.


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