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A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains a sample about 1-2 mm in height and the melting range is found to be 141°- 142°C. In the other determination, the sample height is 4-5 mm and the melting range is found to be 141°-145°C. Explain the broader melting-point range observed for the second sample. The reported melt- ing point for the compound is 143°C.

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