What volume of oxygen should be taken for the oxidation reaction of carbon monoxide (II)

What volume of oxygen should be taken for the oxidation reaction of carbon monoxide (II) to obtain carbon monoxide (IV) massos 11g.

Given:
m (CO2) = 11 g

Find:
V (O2) -?

1) O2 + C => CO2;
2) n (CO2) = m / M = 11/44 = 0.25 mol;
3) n (O2) = n (CO2) = 0.25 mol;
4) V (O2) = n * Vm = 0.25 * 22.4 = 5.6 liters.

Answer: The O2 volume is 5.6 liters.