Thermodynamics Question 218
Question: The latent heat of vaporisation of water is 2240 J/gm. If the work done in the process of expansion of 1 g is 168 J, then increase in internal energy is
[Pb. PET 1998; CPMT 2000]
Options:
A) 2408 J
B) 2240 J
C) 2072 J
D) 1904 J
Show Answer
Answer:
Correct Answer: C
Solution:
$ \Delta Q=\Delta U+\Delta W $
$ \Rightarrow \Delta U=\Delta Q-\Delta W=2240-168=2072\ J $ .
