1. Find the molar mass of CO2:

* Carbon (C): 12.01 g/mol

* Oxygen (O): 16.00 g/mol (x2 since there are two oxygen atoms)

* Total molar mass of CO2: 12.01 + (16.00 x 2) = 44.01 g/mol

2. Calculate the percentage of each element:

* Carbon: (12.01 g/mol / 44.01 g/mol) x 100% = 27.29%

* Oxygen: (32.00 g/mol / 44.01 g/mol) x 100% = 72.71%

Therefore, the percent composition of CO2 is:

* Carbon: 27.29%

* Oxygen: 72.71%