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Fe: a = 2d
S: 2a = c
O: 2b = 2c + 3d
a = 2
2d = a 2d = 2 d = 2/2 d = 1
c = 2a c = 2(2) c = 4
2b = 2c + 3d 2b = 2(4) + 3(1) 2b = 8 + 3 2b = 11 b = 11/2 b = 5.5
a = 2x2 b = 5.5x2 c = 4x2 d = 1x2
a = 4 b = 11 c = 8 d = 2
4FeS2 + 11O2 → 8SO2 + 2Fe2O3