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
Show Answer
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 $
