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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">There's a mistake in Sample Exercise 19.2 in the eText. They give
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del(H_fus) as - 2.29 kJ/mol. That's not possible. Enthalpies of fusion <br>
are always positive. By definition it's the heat required to melt one mole <br>
of the solid. It should be + 2.29 kJ/mol. It is correct in the paper version <br>
of the book. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The del(H_freezing) = - del(H_fus) = - (2.29 kJ/mol) = - 2.29 kJ/mol<br>
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Dr. Zellmer<o:p></o:p></span></p>
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