It depends of the temperature and the pressure. If temperature and pressure are standard 1 mol forms 22.4 liter. So 33.6 liters form 33.6/22.4 = 1.5 mols.
Now calculate the molar mass of carbon dioxide: 12 g/mol + 2x16 g/mol = 44 g/mol
The mass of the 1.5 mols is 1.5mol * 44 g/mol = 66 g.
