18.13) If a 25 gram block of copper at 45C is added to 50 grams of liquid ammonia at -60C, calculate the final temperature of the system. For NH3: NH3 = 17 g/mol, AHvap = 23.4 kJ/mol, Cp(liq)= 35.1 J/mol K, BP = -33.4C For Cu: Cp = 24.4 J/mol K, FWT(Cu) = 63.55 g/mol 101 V ou boue 50 grams of ice at -2.5C sitting in a