How to calculate the mass fraction of iron and oxygen in iron oxide 3?

univerkov | May 26, 2021 | education

Iron (III) oxide formula: Fe2O3. The formula for calculating the mass fraction: u = A * n / M, where A is the relative atomic mass of an element (according to Mendeleev’s table), n is the number of atoms in a molecule of a substance, M is the relative molecular mass of a substance. A (Fe) = 55.8; A (O) = 16; M (Fe2O3) = 55.8 * 2 + 16 * 3 = 159.6. Mass fractions: u (Fe) = 55.8 * 2 / 159.6 = 0.7. u (O) = 16 * 3 / 159.6 = 0.3. You can find mass fractions in percent: u (Fe) = 0.7 * 100% = 70%. u (O) = 0.3 * 100% = 30%.

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