Ah, you want to use the formula ΔT = i * Kf * m, and find molar mass from the molality. But in our lab, when we check purity of a new compound, the textbook Raoult's law approach often gets messy because of impurities we don't account for. So I always insist on running a parallel test with a standard—the freezing point apparatus can be tricky, ashe. My biggest lesson came from a batch of caffeine where the calculated molar mass was perfect, but the impurity profile from the chromatograph told a different story.
#archery#recurve
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