Question

What is the percent composition of CO2?

Answer 1

Mass percentage of Oxygen is 72.7%
Mass percentage of Carbon is 27.3%

Explanation:

Let us consider we begin with one mole of Carbon dioxide molecules. One mole of Carbon Dioxide has one mole of carbon atoms in all and 2 moles of Oxygen atoms as the ratio of Carbon to Oxygen in carbon Dioxide is 1:2.
One mole of Carbon Dioxide has mass 44 g `mol^(-1)`

One mole of Carbon has mass 12 g `mol^(-1)`

One mole of Oxygen has mass 16 g `mol^(-1)`

Two moles of Oxygen has mass 32 g `mol^(-1)`

mass percentage of Carbon = ( 12 g `mol^(-1)`x 100 / 44 g `mol^(-1)`)

mass percentage of Carbon = 1200 / 44 = 27.3%

mass percentage of Oxygen = ( 32 g `mol^(-1)`x 100 / 44 g `mol^(-1)`)

mass percentage of Oxygen = 3200 / 44 = 72.7%