apply Charles formula
i.e; V1/T1= V2/T2
here V1= 8.5L
T1= 31°C
T2= -15°C
V2= ?
substitute the values in the above equation;
8.5/31=V2/(-15)
V2= 8.5/31x(-15)
V2= 0.2741x(-15)
V2= -4.11
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