Change in internal energy of the system

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FOR THE FOLLOWING PROCESS,CALCULATE THE CHANGE IN INTERNAL ENERGY OF THE SYSTEMAND DETERMINE WHETHER THE PROCESS IS ENDOTHERMIC OR EXOTHERMIC:ABALLOON IS HEATED BY ADDING 900JOULES OF HEAT.IT EXPANDS,DOING 422JOULES OF WORK ON THE ATMOSPHERE.A 50-GRAMS SAMPLE OF WATER IS COOLED FROM 30c TO 15C,THEREBY LOSING APPROXIMATELY 3140JOULES OF HEAT.CHEMICAL REACTION RELEASES 8.65KJOULES OF HEAT AND DOES NO WORK ON THE SURROUNDING

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