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Molar Mass accuracy

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Mar16-14, 04:36 PM
P: 37
My chemistry textbooks makes the claim:

Measurements of osmotic pressure
generally give much more accurate molar
mass values than those from freezing-point
or boiling-point changes.

I would have only thought it depended on the accuracy of the measuring devices (thermocouple>thermometer)

Is there a reason behind this claim? Maybe something about the model better correlates with pressure than it does temperature?
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