What is the percent composition of CO2?
Mass percentage of Oxygen is 72.7%
Mass percentage of Carbon is 27.3%
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
One mole of Carbon has mass 12 g
One mole of Oxygen has mass 16 g
Two moles of Oxygen has mass 32 g
mass percentage of Carbon = ( 12 g
mass percentage of Carbon = 1200 / 44 = 27.3%
mass percentage of Oxygen = ( 32 g
mass percentage of Oxygen = 3200 / 44 = 72.7%