7.19 During carbon dioxide arc welding, carbon and oxygen from the CO2 enter into solution in iron at 1600C (1873 X) according to (CO2) [C7fe, wt% + 250)Fe,wt% 46 = 43,855 - 11.4T cal (183, 489-47.70 T J). The final oxygen content of the weld is represented by 10g % 0] 6320 T + 2.734. Calculate the equilibrium carbon content of the weld if the partial pressure of coz is 1 atm (101325 w/m). Assume the following interaction parameter values : = , -0.13,-0.1, = -0.2, and 0.22