t) what turning to a liqukd 2Asample has an experimental melting point of 100-10
ID: 807618 • Letter: T
Question
t) what turning to a liqukd 2Asample has an experimental melting point of 100-101 Cmyou conclude that the sample is pure? Briefly explain your reasoning Using Figure 1, eyim t, ow; percent X and ha melsing point behavior of a mixture composed of 60 mass -hing point 4. An unknown compound melted at 131-133°C E is thought to be one of the following compounds (mp, Ch trans-cinnamic acid (133-134), benzamide (128-130-malic acd (031-133; or benzoin 135-137). The mixture melting points of the unknown compound with each of the test compounds are listed below. What is the unknown compound? Briefly explain your reasoning Unknouw plas trams-cinnamic acid benzamide -malic acid benzoin mp range Cc 110-120 130-132 114-124 08-116 5. Using your textbook or another appropriate resource, find the structural formula for benzoic acid and mandelic acid. Draw the structural formulas of these compoundsExplanation / Answer
2) A sharp melting point is a characteristic of a pure crystal. Since the sample has a range of melting point, it is not fully crystalline and crystallinity decreases with increasing impurities.
4) The mixture of compounds melts at lower temperatures than the melting of pure components. Given the list of values, excluding benzamide + unknown mixture, all the mixture melts at lower temperature than the melting temperature
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