Chemical Thermodynamics Question 324

Question: If the internal energy of a system decreases by 128 J and at the same time it absorbs 56 J of heat, then

Options:

A) work is done by the system equal to +71 J

B) work is done by the system equal to -184 J

C) work is done by the system equal to -71 J

D) work is done by the system equal to 179 J

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Answer:

Correct Answer: B

Solution:

  • $ \Delta E=q+W $ Internal energy decreases by 128 J thus, $ \Delta E=-128J $ Heat is absorbed, $ q=+56J $ Thus, $ W=\Delta E-q=(-128-56)J=-184J $


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