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What is the chemical composition of aluminum oxide?
Aluminum oxide, also known as alumina, has a chemical formula Al2O3. It is a compound composed of two aluminum atoms bonded to three oxygen atoms. The chemical composition of aluminum oxide is 52.93% aluminum and 47.07% oxygen by mass.
Step 1: Determine the chemical formula
The chemical formula of aluminum oxide is Al2O3, which indicates that each molecule of aluminum oxide contains two aluminum atoms and three oxygen atoms.
Step 2: Calculate the molar mass
To calculate the molar mass of aluminum oxide, we need to determine the atomic masses of aluminum and oxygen. The atomic mass of aluminum is approximately 26.98 g/mol, while the atomic mass of oxygen is approximately 16.00 g/mol. Therefore, the molar mass of aluminum oxide can be calculated as:(2 × 26.98) + (3 × 16.00) = 101.96 g/mol
Step 3: Determine the percentage composition
To determine the percentage composition of aluminum oxide, we need to calculate the mass percent of each element in the compound. The mass percent of aluminum can be calculated as:(2 × atomic mass of aluminum) / molar mass of aluminum oxide= (2 × 26.98) / 101.96= 52.93%Similarly, the mass percent of oxygen can be calculated as:(3 × atomic mass of oxygen) / molar mass of aluminum oxide= (3 × 16.00) / 101.96= 47.07%Therefore, the chemical composition of aluminum oxide is 52.93% aluminum and 47.07% oxygen by mass.
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