Practice problem for Thursday: It is proposed to cool a stream of 75wt% sulfuric acid solution at 330K by diluting it with chilled water at 280K. Determine the amount of water that must be added to 1kg of 75wt% acids before cooling below 330K actually occurs. (ii) The following liquids, all at atmospheric pressure and 300K, are mixed: 25kg of pure water, 40 kg of pure sulfuric acid, and 75kg of 25wt% sulfuric acid. (a) How much heat is liberated if mixing is isothermal at 300K ? (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? Practice problem for Thursday: It is proposed to cool a stream of 75wt% sulfuric acid solution at 330K by diluting it with chilled water at 280K. Determine the amount of water that must be added to 1kg of 75wt% acids before cooling below 330K actually occurs. (ii) The following liquids, all at atmospheric pressure and 300K, are mixed: 25kg of pure water, 40 kg of pure sulfuric acid, and 75kg of 25wt% sulfuric acid. (a) How much heat is liberated if mixing is isothermal at 300K ? (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