Molar Mass accuracy

  1. 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?
  2. jcsd
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