Heat transfer is done on a system with the only result of de

Heat transfer is done on a system with the only result of decreasing the internal energy of the system. If 120 BTU of heat is transferred FROM the system, what is the change in internal energy of the system? Express your answer in units of kJ. (ROUND your answer to the nearest integer)

Solution

From first law of thermodynamics

dQ= dU + dW

If there is no work then dW = 0

dQ = dU = 120 btu = 126606.70 J = 126607 J = 126.607 kJ