An iron melt contains 0.50 % C, 0.05 % 0 and 0.40%Si. Using the 1 wt. % standard state calculate activity coefficients of C, Si and O. The relevant interaction coefficients in liquid iron at 1600 C are as follows: Added element 0 Dissolved element C Si Si -0.10 -0.25 -0.20 0.1 0.32 -0.14 0.22 0.24 -0.13 0