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OpenStudy (anonymous):

calculate the change in internal energy of the system and determine if the process is endothermic or exothermic: a 50g sample of water is cooled from 30 degrees C to 15 degrees C, losing approx. 3140 J of heat.

OpenStudy (anonymous):

Use the 1st law of TD: Change in U = Work done + Heating done Heating done = mass * specific heat capacity (of water in this case) * change in temperature. Work done = 0 (in this case no mechanical work is being performed)

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