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c. 400 torr
PV = nRT
Since the number of moles of gas and the gas constant are constant, we can use the formula:
P1V1/T1 = P2V2/T2
(800 torr)(4 L)/(320 K) = P2(2 L)/(160 K)
P2 = (800 torr * 4 L * 160 K) / (320 K * 2 L)
P2 = 400 torr