1. Find the molar mass of CO2:

* Carbon (C) has a molar mass of 12.01 g/mol

* Oxygen (O) has a molar mass of 16.00 g/mol

* CO2 has one carbon and two oxygen atoms, so its molar mass is 12.01 + (2 * 16.00) = 44.01 g/mol

2. Use the formula:

* Moles = Mass / Molar Mass

3. Plug in the values:

* Moles of CO2 = 11g / 44.01 g/mol

* Moles of CO2 ≈ 0.25 mol

Therefore, there are approximately 0.25 moles of CO2 molecules present in 11 grams of carbon dioxide.