At stp (Standard temperature and pressure, T = 273K and P = 1 atm), one mol of gas will occupy 22.4 Liters of volume, but in our question we are given the mass of the gas CO2, we need to find the number of moles in this amount of mass, we will do that by using its molar mass, which is 44.01 g/mol
44.01g = 1 mol
37.4g = x moles
x = 0.85 moles of CO2 in 37.4 grams
Now we have the number of moles and we can find the volume it occupies
22.4 L = 1 mol
x Liters = 0.85 moles
x = 19 Liters of volume will 37.4 grams of CO2 occupy