J.R. S. answered 07/13/18
Tutor
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
At constant pressure, you can use Charles' Law.
V1/T1 = V2/T2
V1 = 20 liters
T1 = 100K
V2 = ?
T2 = 300K
Solving for V2, you have V2 = V1T2/T1
I'll leave it to you to solve the equation.