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Answer:
You have a pressure change and temperature change - you can use the combined gas law:
P1V1/T1 = P2V2/T2
Where P1 = 1am
P2 = 0.8atm
T1 = 273K
T2 = 273 + 22 = 295K
V1 = 1.2lL
V2 = x
Explanation: