If the minimum pressure attained by the vacuum pump is 10-4 atm (10.1 N/m), which of the crucible/crucibles can be used to obtain aluminium-free steel? Given: (a) At 1600C (1873 K) AGO G Si0 AG S10 = -57.70 kcal/mole (-241.42 kJ/mol), = -71.60 kcal/mole (-299.57 kJ/mol), and AGO AG A120 = -130.44 kcal/mole (-545.76 kJ/mol), -82.70 kcal/mole (-346.02 kJ/mol), = -256.04 kcal/mole (-1071.3 kJ/mol). Mg0 AG A1203 (b) AG for the transfer of one atom of aluminium from the pure liquid state to an infinitely dilute, wt% solution of aluminium in liquid iron at 1600C (1873 K) is -13 kcal/mole (-54.39 kJ/mol). (c) Aluminium left after deoxidation = 0.2 wt %