Energy Balances on Closed Systems

Inside this lesson

Write the closed-system energy balance with an explicit sign convention
Recognize when W = 0 (rigid vessel, no shaft work)
Compute Q from ΔU for a temperature change
Avoid common sign and heat-capacity mix-ups (Cv vs Cp)

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Educational content covering topics typical of a first- and second-year chemical engineering curriculum. Not a substitute for accredited coursework, and not suitable for real process design, plant operation, or safety decisions without review by a licensed professional engineer.