W(Fe) = Ar(Fe) * n / Mr(Fe2O3) *100% = 56 * 2 / 160 *100% = 70%
W(O) = Ar(O) * n / Mr(Fe2O3) *100% = 16 * 3 / 160 *100% = 30%
W(Fe) = Ar(Fe) * n / Mr(Fe2O3) *100% = 56 * 2 / 160 *100% = 70%
W(O) = Ar(O) * n / Mr(Fe2O3) *100% = 16 * 3 / 160 *100% = 30%