Find the mass of carbon dioxide in 400 liters of air under normal conditions, if it is known that the volume fraction

Find the mass of carbon dioxide in 400 liters of air under normal conditions, if it is known that the volume fraction of carbon dioxide in the air is 2%

V (CO2) – volume of CO2, Vair – volume of air, Vm – molar volume, n – amount of matter, mm (CO2) – molar mass, m (CO2) – desired mass of CO2
1) Find the number of moles of a substance through the volume of CO2:
V (CO2) = Vair * 0.02
n = V (CO2) / Vm

n = 0.36 mol (approximate value)
2) Find the mass of CO2:
m (CO2) = mm (CO2) * n

m (CO2) = 15.84 g