Question

A sample of 2.45g aluminum oxide decomposes into 1.3g of aluminum and 1.15g of oxygen. What is the percentage composition of the compound?

Answer 1

Answer:

%$Al = 53.1%$%

%$O = 46.9$%

Explanation:

If we know the grams of a chemical compound in a specific reaction, it is possible to know the percentage of each atom that composes it.

For the Aluminum Oxide in this problem, we know its total weight and the grams of each component.

therefore we can determine the percentage ratio of its components through:

For Al

%$Al = \frac{mass of Al}{mass of Aluminium oxide} . 100$%

% $Al = \frac{1,3 g}{2,45 g} . 100$%

%$Al = 53.1%$%

In the same way for oxygen

%$O = \frac{mass of O}{mass of Aluminium oxide} . 100$%

%$O = \frac{1,5 g}{2,45 g} . 100$%

%$O = 46.9$%