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b) Fe2O3
a)(112*100%)/160=70%
b) Fe - 56u
O - 16 u
Fe2 - 56*2 = 112u
O3 - 16*3 = 48u
112u+48u = 160u
160u - 100%
112u - x%
x = 112*100% / 160
x = 70 %
odp. zawartość żelaza w związku Fe2O3 wynosi 70%