1 out of 3 attempts Be sure to answer all parts. Assistance Check My Work View H

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1 out of 3 attempts Be sure to answer all parts. Assistance Check My Work View Hint View Question Show Me Guided Solution Practice This Question Print Question Help Report a Problem Using data from your text and assuming that the tabulated values do not change with temperature, (a) calculate Hfus and ASfus for sodium metal and determine the melting temperature of sodium. AS. fus melt kJ/mol J/K.mol (b) calculate Hovan and ASovan for sodium metal and determine the boiling temperature of vap sodium. AS vap vap boil kJ/mol J/K.mol

Explanation / Answer

The Gibbs free energy change is zero during the phase change of a substance.

delG = 0 = delH - T delS

delS = delH /T (during the phase transformation)

THe values are taken from the literature.

Now del H (fus) = 2.6 KJ/mole. and melting point of sodium = 97.72 +273 = 370.72 K.

delS ( fus) = 2.6 *10^3 / 370.72 J/K.mole = 7.01 J/K.mole.

similarly for the boiling point

del H (vap) = 97.7KJ/mole. and boiling point of sodium = 883 +273 = 1156 K.

delS (vap) = 97.7 *10^3 /1156 J/K.mole = 84.51 J/K.mole.

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