A) 36 J
B) 15 J
C) 18 J
D) 9 J
Correct Answer: C
Solution :
From first law of thermodynamics \[\Delta Q=\Delta Q+W\] where \[\Delta U={{U}_{f}}-{{U}_{i}}\] and heat released \[=20\,J=-\Delta Q\] \[\therefore \] \[\Delta W=-8\,J,\,\,\,{{U}_{i}}=30\,J\] \[\Delta U=\Delta Q-\Delta W\] \[\Delta U=-20-(-8)=-12\,J\] Final internal energy \[{{U}_{f}}={{U}_{i}}+\Delta U\] = 30 - 12 = 18 JYou need to login to perform this action.
You will be redirected in
3 sec