7.17 Liquid iron containing 0.0105 wt% aluminium is equilibrated with an alumina crucible at 1727C (2000 K). The equilibrium is represented by A1203 2[41]Feowt% + 3[0]fe,wt% + K2000 3.162 x 10-12 Calculate the residual oxygen in the melt. Given: (a) Activity coefficient of oxygen in binary Fe-o alloy is unity. (b) Activity coefficient of aluminium in binary Fe-A1 alloy is unity. (c) ?- - 3.15. . A (d) Atomic weights of Al and 0 are 27 and 16 respectively