J.R. S. answered 05/02/19
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V1 = 12 L
T1 = 15.5 K
V2 = ?
T2 = 25.0 K
Since the pressure is constant, you are dealing with Charles' Law.
V1/T1 = V2/T2 and solving for V2..
V2 = V1T2/T1 = (12 L)(25.0K)/15.5K) = 19.4 L = 19 L (2 s.f.)