The molar mass of CO2 is 44.01 g/mol. This means that 33.6 g of CO2 is equal to 33.6 g / 44.01 g/mol = 0.763 mol of CO2.

One mole of CO2 contains 6.022 x 10^23 molecules of CO2. Therefore, 0.763 mol of CO2 contains 0.763 mol x 6.022 x 10^23 molecules/mol = 4.59 x 10^23 molecules of CO2.

Therefore, there are 4.59 x 10^23 molecules of CO2 in 33.6g CO2.