What is the mass fraction of aluminum in its oxide?
| February 5, 2021 | education
The mass fraction of an element in a compound is found as the ratio of the sum of the relative atomic masses of all atoms of this element to the relative molar mass of the compound.
Aluminum oxide has the formula Al2O3. This substance contains three oxygen atoms and two aluminum atoms. The relative atomic mass of aluminum is 27, the relative molecular weight of Al2O3 = 2 * 27 + 3 * 16 = 102. Let’s find the mass fraction of aluminum in the compound:
w (Al) = (2 * 27) / 102 = 0.5294 or 52.94% is the mass fraction of aluminum in its oxide.
Answer: 52.94%
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