When a system is taken from thermodynamic state 
to 
along the path iaf (see figure), it is found that the heat Q absorbed by the system is 50 cal and work W done by the system is equal to 20 cal. Along the path 
. What is W along the path ibf?
Text Solution
Verified by ExpertsA
1. From the first law of thermodynamics
…(ii)
Where Q is the heat absorbed by the system and W is the work done by the system.
For the path iaf; we have
Since internal energy of the system depends only on temperature and no other factor. Therefore 
between i to f is always 30 cal whatever path be adopted.
For the path ibf,
and 
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