Look first we have to find no. Of moles.
no.of moles= mass in grams÷molar mass
mass in g= 1.4g and molar mass= 12+16 = 28
So no.of moles = 1.4÷28 = 0.05
Now 1 mole of CO has the volume=22.414
SO 0.05 molesbof CO has the volume= 22.414×0.05=1.12
Hope it helps :)