A system undergoes a change of rate during which 100 kJ of heat is transferred to it and it does 50 kJ of work. The system is brought back to its original state through a process during which 120 kJ of heat is transferred to it. The work done by the system is

A system undergoes a change of rate during which 100 kJ of heat is tra

1.	A system undergoes a change of rate during which 100 kJ of heat is transferred to it and it does 50 kJ of work. The system is brought back to its original state through a process during which 120 kJ of heat is transferred to it. The work done by the system is
A.	50 kJ
B.	70 kJ
C.	170 kJ
D.	none of these
Answer» D. none of these

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A system undergoes a change of rate during which 100 kJ of heat is transferred to it and it does 50 kJ of work. The system is brought back to its original state through a process during which 120 kJ of heat is transferred to it. The work done by the system is

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