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A balloon is filled with oxygen (O2) at 20.0°C and 2.0 atm. The volume of the...

A balloon is filled with oxygen (O2) at 20.0°C and 2.0 atm. The volume of the balloon after filling= 5.50 m3. The gas is heated until its temperature= 80.0°C. During this process, the balloon expands at constant pressure (2.0 atm). What is the heat flow into the helium in J?

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