Answer
$\Delta S=0.072\frac{J}{K}$
Work Step by Step
We know that:
$\Delta S=Q(\frac{1}{T_2}-\frac{1}{T_1})$
We plug in the known values to obtain:
$\Delta S=260(\frac{1}{360}-\frac{1}{400})=0.072\frac{J}{K}$
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