Thermodynamics Question 225
Question: The internal energy change in a system that has absorbed 2 Kcal of heat and done 500 J of work is
Options:
A) 8900 J
B) 6400 J
C) 5400 J
D) 7900 J
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ \Delta Q=\Delta U+\Delta W\Rightarrow 2\times 10^{3}\times 4.2=\Delta U+500 $
$ \Rightarrow \Delta U=7900J $
