%composition
what is the percent composition of oxygen in the following compounds:
co2
dinitrogen pentoxide

1. Percentage composition O in CO₂ is 72.7%

2.Percentage composition of O in N₂O₅ is 74.1%

Explanation:

How to calculate percentage composition

I. Calculate the molar mass of the compound by summing up the atomic masses of the elements that makes up the compound

II. The percentage composition of the element is derieved by dividing the atomic mass of the atoms by the molar mass of the compound

III. Now express this ratio as a percentage.

1. Percentage composition of Oxygen in CO₂:

Molar mass of CO₂

Atomic mass of C = 12gmol⁻¹

Atomic mass of O = 16gmol⁻¹

Note: We have two atoms of Oxygen

Molar mass = [12 + (2x16)]gmol⁻¹

= (12 + 32)gmol⁻¹

= 44gmol⁻¹

Percentage composition O in CO₂

= (2x16)/44 x 100

= 32/44 x 100

= 0.727 x 100

= 72.7%

Percentage composition O in CO₂ is 72.7%

2. The percentage composition of O in N₂O₅

Atomic mass of N = 14gmol⁻¹

Atomic mass of O = 16gmol⁻¹

Molar mass of N₂O₅ = [(2x14) + (5x16)]gmol⁻¹

= (28 + 80)gmol⁻¹

= 108gmol⁻¹

Percentage composition of O in N₂O₅

= (5x16)/108 x 100

= 80/108 x 100

= 0.741 x 100

= 74.1%

Percentage composition of O in N₂O₅ is 74.1%

Note: Percentage composition is expressed as a percentage.

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