**We can use the formula below to determine the entropy change(ΔS):**

$\overline{){\mathbf{\u2206}}{\mathbf{S}}{\mathbf{=}}\frac{\mathbf{\u2206}{\mathbf{H}}_{\mathbf{fus}}}{\mathbf{T}}}$

where ΔH_{fus }is the heat of fusion

T is the temperature in Kelvin (K)

**Recall**:

**1 kJ = 10 ^{3} J**

Calculate the change in entropy that occurs in the system when 45.0
g of acetone (C_{3}H_{6}O) freezes at its
melting point (-94.8 ˚C). ΔH_{fus} = 5.69 kJ/mol.

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