Determine the mass fraction of aluminum in its oxide.
September 15, 2021
To determine the mass fraction of Aluminum (Al) in its oxide, you need to know the formula of aluminum oxide – Al2O3 And also the relative atomic mass of each constituent element and the molecular weight of the oxide.
From the periodic table we learn that
Ar (Al) = 26.98 amu
Ar (O) = 16 amu
Mr (Al2O3) = 26.98×2 + 16×3 = 101.96 amu
The mass fraction of the element (E) in the substance (EmOn) is determined by the formula: w (E) = mAr (E) / Mr (EmOn) х100%.
w (Al) = 3×26.98 / 101.96×100% = 79.38%
So, the mass fraction of aluminum in its oxide is 79.38%
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