What is the percent by mass of oxygen in Al2O3?
[(molar mass O3)/(molar mass Al2O3)] x 100%
What is the mass percentage of oxygen in Al2O3 and in step by step.
To calculate the percent by mass of oxygen in Al2O3 (aluminum oxide), you need to determine the molar mass of oxygen and the molar mass of Al2O3.
The molar mass of oxygen (O) is approximately 16.00 grams per mole.
To find the molar mass of Al2O3, you need to look up the atomic masses of aluminum (Al) and oxygen (O) from the periodic table. Aluminum has an atomic mass of approximately 26.98 grams per mole, and oxygen has an atomic mass of approximately 16.00 grams per mole.
Since there are two aluminum atoms in Al2O3, the molar mass for aluminum in Al2O3 is 2 * 26.98 = 53.96 grams per mole.
Since there are three oxygen atoms in Al2O3, the molar mass for oxygen in Al2O3 is 3 * 16.00 = 48.00 grams per mole.
Now, you can determine the percent by mass of oxygen in Al2O3 using the following formula:
Percent by mass of oxygen = (molar mass of oxygen / molar mass of Al2O3) * 100
Substituting the values we found:
Percent by mass of oxygen = (48.00 / (53.96 + 48.00)) * 100
Calculating this expression gives:
Percent by mass of oxygen = (48.00 / 101.96) * 100
Simplifying:
Percent by mass of oxygen ≈ 47.06%
Therefore, the percent by mass of oxygen in Al2O3 is approximately 47.06%.
To find the percent by mass of oxygen in Al2O3, we need to determine the masses of oxygen and the entire compound, Al2O3.
First, we need to calculate the molar mass of Al2O3:
- The atomic mass of aluminum (Al) is approximately 26.98 g/mol.
- The atomic mass of oxygen (O) is approximately 16.00 g/mol.
Al2O3 consists of 2 aluminum atoms and 3 oxygen atoms. Therefore, the molar mass of Al2O3 can be calculated as follows:
Molar mass of Al2O3 = (2 × atomic mass of Al) + (3 × atomic mass of O)
Molar mass of Al2O3 = (2 × 26.98 g/mol) + (3 × 16.00 g/mol)
Next, we need to calculate the mass of oxygen in Al2O3:
- Since Al2O3 consists of 3 oxygen atoms, we can determine the mass of oxygen by multiplying the molar mass of oxygen by 3.
Now, we can calculate the percent by mass of oxygen in Al2O3 using the following formula:
Percent by mass of oxygen = (mass of oxygen / mass of Al2O3) × 100
To summarize:
1. Calculate the molar mass of Al2O3.
2. Determine the mass of oxygen in Al2O3.
3. Apply the formula to calculate the percent by mass of oxygen.