The evaporation of four grams of water at 100°C utilizes 9027 J heat. (a) Express this amount of heat in calories and kJ. (b) Is the evaporation process endothermic or exothermic? When water evaporates and transforms into a gas, heat energy is ___ by the system. Thus, the process of evaporation is ___ (c) Will the heat transfer value (q) be positive or negative for this reaction? In the evaporation of water, the system (water) ___ heat. Therefore, q will be ___.