The Molar Mass of a Solid as Determined by Freezing-Point

question 25

Multiple Choice

The molar mass of a solid as determined by freezing-point depression is 10% higher than the true molar mass. Which of the following experimental errors could not account for this discrepancy?

• A) Before the solution was prepared, the container was rinsed with solvent and not dried.
• B) Some solid was left on the weighing paper.
• C) Not all the solid was dissolved.
• D) The solid dissociated slightly into two particles when it dissolved.
• E) More than the recorded amount of solvent was pipetted into the solution.

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