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Determining the sign of work and heat

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Can anyone explain to me this question and please explain the sign of the work and heat, please. Especially for b, I thought if the work attend to the system, if will be positive so there isn't any process that have negative delta E. Please explain to me the sign of work and heat, work done or by the system and endothermic and exothermic.

Reference no: EM132403732

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