Discussion
Molality is preferred to molarity in work over a range of temperatures because
Answer: C
Correct answer: the solvent mass does not change with temperature
Molarity has a volume in its denominator, and the solution expands as it warms, so a solution made up to 1 molar at 20 degrees is slightly less than 1 molar at 60. Molality is a ratio of two masses, both of which are temperature-independent, so the value is fixed once the solution is made. That is why colligative property work and any experiment over a temperature range uses molality.
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