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The heat of fusion of ethanol (C2H5OH) at its normal melting point of -114°C is 5.0...

The heat of fusion of ethanol (C2H5OH) at its normal melting point of -114°C is 5.0 kJ/mol, while its heat of vaporization at its normal boiling point of 78°C is 38.6 kJ/mol.

(a) Use these data to calculate the heat of sublimation for C2H5OH.    kJ/mol

Is your answer precise or is it approximate? _________



(b) At 298 K, the standard heat of formation of C2H5OH(l) is -277.6 kJ/mol while the standard heat of formation of C2H5OH(g) is -234.8 kJ/mol. Use this to calculate the heat of vaporization of ethanol. kJ/mol.

Is your result for part (b) larger or smaller than the value given in the statement of the problem? _________

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Result in part b) is coming out larger than the value given in the statement of problem.

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