What is the volume of carbon (IV) oxide. Can be obtained from coal weighing 50 g

What is the volume of carbon (IV) oxide. Can be obtained from coal weighing 50 g, the mass fraction of incombustible impurities in which is 4%?

The combustion reaction of carbon is described by the following chemical reaction equation:
C + O2 = CO2;
From one mole of carbon, one mole of its oxide is obtained.
Let’s determine the amount of pure carbon substance.
N C = 50/12 x 0.96 = 4 mol;
Under normal conditions, one mole of ideal gas takes up a volume of 22.4 liters.
V CO2 = 4 x 22.4 = 89.6 liters;