A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide Use this data to calculate the mass percent composition of aluminum in aluminum oxide.

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To calculate the mass percent composition of aluminum in aluminum oxide, you first need to find the mass of aluminum and aluminum oxide.

Given:
Mass of aluminum, Al = 4.78 g
Mass of aluminum oxide, Al2O3 = 6.67 g

To find the mass percent composition of aluminum, use the following formula:

Mass percent composition of Aluminum (Al) = (Mass of Aluminum / Mass of Aluminum Oxide) × 100

1. Calculate the molar mass of aluminum:
The molar mass of aluminum (Al) is 26.98 g/mol.

2. Convert the mass of aluminum to moles:
Moles of Aluminum (Al) = Mass of Aluminum / Molar mass of Aluminum

Moles of Al = 4.78 g / 26.98 g/mol

3. Calculate the molar mass of aluminum oxide:
The molar mass of aluminum oxide (Al2O3) is 101.96 g/mol.

4. Convert the mass of aluminum oxide to moles:
Moles of Aluminum oxide (Al2O3) = Mass of Aluminum oxide / Molar mass of Aluminum oxide

Moles of Al2O3 = 6.67 g / 101.96 g/mol

5. Calculate the mass percent composition of aluminum:
Mass percent composition of Aluminum (Al) = (Moles of Aluminum / Moles of Aluminum oxide) × 100

Mass percent composition of Al = (4.78 g / 26.98 g/mol) / (6.67 g / 101.96 g/mol) × 100

Simplify the equation:

Mass percent composition of Al = (4.78 g / 26.98 g/mol) × (101.96 g/mol / 6.67 g) × 100

Mass percent composition of Al ≈ 53.4%

Therefore, the mass percent composition of aluminum in aluminum oxide is approximately 53.4%.

To calculate the mass percent composition of aluminum in aluminum oxide, you need to determine the mass of aluminum in aluminum oxide and then calculate the mass percent.

Step 1: Find the mass of aluminum:
We are given that the initial mass of aluminum is 4.78 g. Let's assume that all the aluminum reacts to form aluminum oxide. So, the mass of aluminum in the oxide will also be 4.78 g.

Step 2: Calculate the mass of aluminum oxide:
Given that the mass of aluminum oxide is 6.67 g.

Step 3: Calculate the mass percent composition:
The mass percent composition of aluminum in aluminum oxide can be calculated using the formula:

Mass percent = (mass of aluminum / mass of aluminum oxide) x 100

Substituting the values we found:

Mass percent = (4.78 g / 6.67 g) x 100

Simplifying:

Mass percent = 0.7177 x 100

Mass percent = 71.77%

Therefore, the mass percent composition of aluminum in aluminum oxide is approximately 71.77%.

Remember to always double-check your calculations and ensure that your units are consistent throughout the calculation.

100 (4.78/6.67)