J.R. S. answered 03/02/21
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Combined gas law:
P1V1/T1 = P2V2/T2
P1 = 1.2 atm
V1 = 1.28 L
T1 = 45C + 273 = 318K
P2 = 1 atm (standard pressure)
V2 = ?
T2 = 273K (standard temp)
Plug in the values and solve for V2...
V2 = P1V1T2 / P2T1