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Heat of Reaction

In a process,...

Question

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

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Solution

System absorbs $701 J$ of heat which has positive sign and does $394 J$ of work which has negative sign.
According to the first law of thermodynamics,
$Δ U = q + w = 701 - 394 = 307 J$ .

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