I am having troubles with this one question if anyone is able to help that would

Question

I am having troubles with this one question if anyone is able to help that would be great :)

An organic chemistry student recrystallizes their unknown from ethanol and obtains beautiful white needle-like crystals. He has narrowed the identity of his unknown to either molecule X, molecule Y, or molecule Z. The Merck Index tells him that all three molecules produce white, needle-like crystals from ethanol. How might he definitively identify his unknown molecule? The student does not have access to any spectroscopic equipment.

Explanation / Answer

Melting point or density may be used to ditinguished.

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