When a system is taken from state “x‟ to state “y‟, 30kJ of heat flows into the system and the system does 10kJ of work. When the system is returned from “y‟ to “x‟ along another path, work done on the system is 8 kJ. What is the amount of heat liberated or absorbed?
(A) 12kJ of the heat liberated
(B) 28 kJ of heat liberated
(C) 12kJ of the heat absorbed
(D) 28 kJ of heat absorbed