Charle's Law states: V/T = k
where k is a constant
We can get this from the ideal gas law when pressure, and number of moles are held constant.
We can also use this and say
V₁/T₁ = k = V₂/K₂
V₁/T₁ = V₂/K₂
38.8°C = 311.95 K
-39.9°C = 233.25 K
8.89L/311.95K = V₂/233.25K
V₂ = 6.65 L
The gas will have a volume of 6.65 L at -39.9°C.
