3ased on sign convention, heat transfers into the system are denoted as positive and work is done BY the system is lenoted as positive. For the closed system, the energy conservation equation is E12=QW. Now for a closed system, here are 10kJ heat transfers into the system, and the surroundings do 5kJ work onto the system. To calculate the energy hange for this system, which statements are TRUE? Based on the sign convention, plug 5kJ for W in the conservation equation. The total energy change is 15kJ which means the energy increases 15kJ at the end of the process. Based on the sign convention, plug 5kJ for W in the conservation equation. The total energy change is 5kJ which means the energy decreases by 5kJ at the end of the process. Based on the sign convention, plug 10kJ for Q in the conservation equation