He dissolution of gases in water is virtually always exothermic because __________. a gases react exothermically with water b the exothermic step in the solution-formation process is unnecessary c neither of the two endothermic steps in the solution-formation process is necessary d all three steps in the solution-formation process are exothermic e one of the two endothermic steps (separation of solute particles) in the solution-formation process is unnecessary