Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
Correct answer: A. +4000
- A. +4000
- B. -4000
- C. 10000
- D. -10000
Explanation
Using the first law with work done on the gas, ΔU = heat added + work on gas = -3000 + 7000 = +4000 kJ. The negative heat sign is used because the surroundings are heated during compression.
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