Calculate DE, and determine whether the process is endothermic or exothermic for the following cases:
(a) A system releases 43 kJ of heat to the surroundings and has 665 kJ of work done on it by the surroundings.
DE = kJ. This process is.
(b) q = 35 kJ and w = -287 kJ.
DE = kJ. This process is.
(c) A system absorbs 246 kJ of heat from the surroundings and has 766 kJ of work done on it by the surroundings.
DE = kJ. This process is.