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Fe(OH)3
56u + 16u*3 + 3u= 107u
Żelazo
107u - 100%
56u - x
X= 56*100/56=52,3%
Tlen
107u - 100%
48u - x
X= 48*100/107=44,86%
Wodór
107u - 100%
3u - x
X= 3*100/107=2,8%