Chapter 18, Problem 33E

Calculate the change ¡n entropy that occurs in the system when 45.0 g of acetone (C₃H₆O) freezes at its melting point (—94.8°C). See Table 11.9for heats of fusion.

Table 11.9 Heats of Fusion of Several Substances

Liquid	Chemical Formula	Melting Point (°C)	$\Delta H_{\text{fus}}(\text{kJ}/\text{mol})$
Water	H2O	0.00	6.02
Rubbing alcohol(isopropyl alcohol)	C3H8O	−89.5	5.37
Acetone	C3H6O	−94.8	5.69
Diethyl ether	C4H10O	−116.3	7.27