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1.     For the following processes, calculate the change in internal energy of the system and determine

whether the process is endothermic or exothermic

a.    A balloon is heated by adding 255 J of heat while it does 546 J of work on atmosphere.

b    A gas is cooled and releases 0.565 kJ of heat into the atmosphere while the atmosphere does 65 J of work on the gas.

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