Calculate the volume of carbon dioxide that can be obtained by reacting oxygen with 20 g of coal containing 10% impurities.

1. Let’s compose an equation that reflects the ongoing reaction:

C + O2 = CO2.

2. Let’s calculate the mass of carbon:

m (C) = w (C) * m (coal);

w (C) = 1 – w (impurities) = 1 – 0.1 = 0.9;

m (C) = 0.9 * 20 = 18 g.

3. Let’s calculate the chemical amount of carbon:

n (C) = m (C): M (C) = 18: 12 = 1.5 mol.

4. Determine the amount of carbon dioxide produced:

n (CO2) = n (C) = 1.5 mol.

5. Let’s calculate the volume of carbon dioxide:

V (CO2) = n (CO2) * Vm = 1.5 * 22.4 = 33.6 liters.

Answer: 33.6 liters.