To answer this item, it is best that we assume that CO2 behaves like an ideal gas. So we can use the equation,
n = PV/RT
Substituting the known values,
n = (1.125 atm)(0.475L)/(0.0821 L.atm/mol.K)(-22°C + 273.15)
n = 0.0259 mol
Thus, the number of moles of CO2 that would fit in the bag is approximately 0.0259 mols.