A mixture of hydrogen and chlorine with a total volume of 20 liters was detonated. Determine the volume of the gas mixture

A mixture of hydrogen and chlorine with a total volume of 20 liters was detonated. Determine the volume of the gas mixture remaining after the reaction, measured under the same conditions. Does the final volume of the gas mixture depend on what substance was in excess?

H2 + Cl -> 2HCI
According to the equation, we see that the product of the reaction is gaseous hydrogen chloride. If initially the volume of gases was 20 liters, then after the reaction the volume of the gas mixture will also be equal to 20 liters, and it does not depend on which substance was taken in excess.