Question 4 (2 points) What is the percent composition of oxygen in aluminum phosphate? Round answer
to 3 significant figures.
A/

52.5%.

Explanation:

The formula for aluminum phosphate is => AlPO₄

Next, we shall determine the molar mass of aluminum phosphate, AlPO₄. This can be obtained as follow:

Molar mass of AlPO₄ = 27 + 31 + (16×4)

= 27 + 31 + 64

= 122 g/mol

Next, we shall determine the mass of oxygen (O) in AlPO₄. This can be obtained as follow:

There are 4 atoms of O in AlPO₄.

Mass of O = 4 × 16 = 64 g

Finally, we shall determine the percent composition of oxygen in aluminum phosphate, AlPO₄. This can be obtained as follow:

Mass of O = 64 g

Molar mass of AlPO₄ = 122 g/mol

Percentage composition of oxygen =?

Percentage composition = mass of element/Molar mass of compound ×100

Percentage composition = 64/122 × 100

Percentage composition = 52.5%

Therefore, the percent composition of oxygen in aluminum phosphate, AlPO₄ is 52.5%