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Draw a structure for a compound that meets the following description: A compound C3H5N with an IR absorption at 2215 cm-1 but none at 3300 cm-1

A 0.996g sample of an unknown was dissolved in 10.2 g acetic acid. If the freezing point depression of the solution was 4.13°C, find the molar mass of the unknown. 16.6 is the freezing point for acetic acid.

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