A sample of substance cap x that has a mass of 326 point 0 g releases 4325 point 8 cal when it freezes at its freezing point. If substance x has a molar mass of 58 point 4 5 g over mol , what is the molar heat of fusion for substance cap x ? Use q is equal to n triangle cap h

First find the amount of substance: 326.0 g ÷ 58.45 g/mol ≈ 5.577 mol. Divide the heat released by the number of moles: 4325.8 cal ÷ 5.577 mol ≈ 775.6 cal/mol. The molar heat of fusion is the same magnitude for freezing and melting, so the answer is choice D, 775.6 cal/mol.

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