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

Answer

170KJ

Explanation

`triangleQ_(1) = 100 Kj traingle W_(1) = 50 kj`
`triangleQ_(2) = 120 kj W_(2) = ?`
given process is cyclic process
Hence `triangleU = 0`
` rArr triangleQ_(1) + triangleQ_(2) = triangleW_(1) + triangleW_(2)`
`100+120 = 50+ triangleW_(2)`
`triangleW_(2) = 170 kj`