Answer
$0.2L$
Work Step by Step
By ideal gas law :
PV=NRT;
T=78F=298.7K
$\frac{P}{NR}=\frac{298.7}{3.5}=85.3$
For T=48F=282K
$V=\frac{282}{85.3}=3.3L$
Thus, volume decreased by $3.5-3.3=0.2L$
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