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Question: A balloon originally had a volume of 5.39 L at 44 C and a pressure of 755 torr. To what temperature must the balloon be cooled to reduce its volume to 4.00 L at a pressure of 620 torr?   Edit

Answer:
P1V1 / T1 = P2V2 / T2
755* 5.39/(273+44)=620 * 4.00/T2
T2= 193.18 in kelvin
T= -79.30 in degree Celsius  Edit


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