Thermodynamics Question 233
Question: The change in internal energy of a thermo- dynamical system which has absorbed 2 kcal of heat and done 400 J of work is $ (1cal=4.2J) $
Options:
A) 2 kJ
B) 8 kJ
C) 3.5 kJ
D) 5.5 kJ
Show Answer
Answer:
Correct Answer: B
Solution:
[b] According to first law of thermodynamics $ Q=\Delta U+W $
Given: $ Q=2kcal=2000\times 4.2=8400J $
$ W=400J $
$ \Delta U=Q-W=8400-400=8000J $
