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100%-53,85%=46,15%
mS=32u
3x32u=96u
96u-46,15%
x -53,85%
x=112u
112u:2=56u
Fe-żelazo
Fe2S3
siarczek żelaza(III)
%X = 53,85% = 2*X * 100% / 2X + 32 * 3
2*X * 100% / 2X + 32 * 3
2X * 100% / 2X + 96 = 53,85% | * (2x + 96)
2X * 100% = 53,85% * (2X + 96) | :100%
2X = 0,5385 * (2X + 96)
2X = 1,077X + 51,696 | - 1,077X
0,923X = 51,696 | : 0,923
X = 56
Fe waży 56u, więc ten tlenek to Fe2O3