2.58. The following liquids, all at atmospheric pressure and 120(F), are mixed: 25(lbm) of pure water, 40(lbm) of pure sulfuric acid, and 75(lbm) of 25 -wt-\% sulfuric acid. (a) How much heat is liberated if mixing is isothermal at 120(F) ? (b) The mixing process is carried out in two steps: First, the pure sulfuric acid and the 25-wt-\% solution are mixed, and the total heat of part (a) is extracted; second, the pure water is added adiabatically. What is the temperature of the intermediate solution formed in the first step