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UHS MDCAT 2025 Chemistry uhs mdcat chemistry 2025 #First Law of Thermodynamics #Thermochemistry & Thermodynamics

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If 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system what is the change of internal energy?

Verified Answer & Explanation⌄

Correct Answer: D) +140 kJ

Concept Explanation

Using ΔU = q + w, heat absorbed by the system gives q = +100 kJ and work done on the system gives w = +40 kJ. Thus ΔU = +140 kJ.

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