Jawapan

2016-03-19T13:45:39+08:00
53.70% iron / 56 = 0.96 mol.... / 0.96 = 1 Fe 
46.30% Sulfur./ 32 = 1.43..../ 0.96 = 1.5 S 

Fe1 S1.5 doubles to 

Fe2O3