What is the percent composition of the compound formed when 2.70 g of aluminum combines with oxygen to form 5.10 g of aluminum oxide? show your work

The study of chemicals and bonds is called chemistry.

The correct % of oxygen = 47.1 %  and % aluminium = 52.9 %

All the data is given in the question as follows:-

According to the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products.

Mass oxygen + mass aluminium = mass aluminium oxide

% oxygen =

% oxygen =

% oxygen = 47.1 %

% aluminium =

% aluminium = 52.9 %

The total percentage is 47.1 % + 52.9 % = 100 %.

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% oxygen = 47.1 %

% aluminium = 52.9 %

Explanation:

Step 1: Data given

Mass of aluminium = 2.70 grams

Mass of aluminium oxide = 5.10 grams

Step 2: The balanced equation

4Al + 3O2 →2Al2O3

Step 3: Calculate mass of oxygen

The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products.

Mass oxygen + mass aluminium = mass aluminium oxide

Mass oxygen + 2.70 grams = 5.10 grams

Mass oxygen = 5.10 grams - 2.70 grams

Mass oxygen = 2.40 grams

Step 4: Calculate percent composition

% oxygen = (mass oxygen / mass aluminium oxide) * 100 %

% oxygen = (2.40 grams / 5.10 grams ) * 100 %

% oxygen = 47.1 %

% aluminium = (mass aluminium / mass aluminium oxide)

% aluminium = (2.70 grams / 5.10 grams ) * 100 %

% aluminium = 52.9 %

47.1 % + 52.9 % = 100 %

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