Determine the mass fraction of aluminum in its oxide.
| September 1, 2021 | education
The formula for aluminum oxide is Al2 O3.
According to the periodic table, the mass of aluminum is 27 g / mol, the mass of aluminum in the oxide is, respectively, m (Al2) = 27 * 2 = 54 (g / mol). And the mass of oxygen according to the table is about 16 g / mol. Therefore m (O3) = 48g / mol.
The molar mass of aluminum oxide is m (Al2 O3) = 48 + 54 = 102 (g / mol).
We calculate the mass fraction of aluminum by the formula ω (Al) = m (Al2) / m (Al2 O3) * 100% = (54/102) * 100% ≈ 53%.
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