If a gas absorbs 200kJ energy and consumes 100 kJ to do work. Increase in internal energy is:
Correct answer: C. +100 kJ
- A. .-200 kJ
- B. -100 kJ
- C. +100 kJ
- D. +300 KJ
Explanation
The increase in internal energy is +100 kJ.In this case, the gas absorbs 200 kJ of heat and does 100 kJ of work. The 100 kJ of work that is done by the gas reduces the amount of energy that is available to increase the internal energy of the gas. Therefore, the increase in internal energy of the gas is 200 kJ - 100 kJ = 100 kJ.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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