Question
Question: The P-V diagram of a system undergoing thermodynamic transformation in the figure. The work done by ...
The P-V diagram of a system undergoing thermodynamic transformation in the figure. The work done by the system in going from A® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is -
A
34 J
B
70 J
C
84 J
D
134 J
Answer
34 J
Explanation
Solution
Q (DQ)ABC = 20 cal = 20 × 4.2 J = 84 J
& (DW)ABC = 50 J
by F.L.O.T
DQ = DU + DW
\ DU = DQ – DW = 84 – 50 = 34 J