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Consider that 214 J of work done on a system, and 293 J of heat are extracted from the system. Then
Select one or more:
  • a)
    Q = –293 J
  • b)
    Q = 293 J
  • c)
    ΔU = 79 J
  • d)
    ΔU = –79 J
Correct answer is option 'A,D'. Can you explain this answer?
Verified Answer
Consider that 214 J of work done on a system, and 293 J of heat are ex...
Since work is done on the system, therefore, algebraic sign of work done will be positive and magnitude of work done is 214J.
Since heat is extracted from the system, 
∴ Q = –293 J
Now ΔU = Q + W
= –293 J + 214 J
ΔU = –79 J
The correct answers are: Q = –293 J, ΔU = –79 J
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Most Upvoted Answer
Consider that 214 J of work done on a system, and 293 J of heat are ex...
-293 J (since heat is extracted from the system)
-214 J (since work is done on the system)
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Consider that 214 J of work done on a system, and 293 J of heat are extracted from the system. ThenSelect one or more:a)Q = –293 Jb)Q = 293 Jc)ΔU = 79 Jd)ΔU = –79 JCorrect answer is option 'A,D'. Can you explain this answer?
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