calculate delta e for a system undergoing an endothermic process in which 15.6 kj of heat flows and where 1.4 kj of work is done on the system? q = -15.6 kJ.
w = + 1.4 kJ.
E = q + w.
E = - 15.6 kJ + 1.4 kJ = - 14.2 kJ.