33.6 liters of hydrogen sulfide burned in an excess of oxygen, the product yield is 75 percent, the volume of SO2 =?

Given:
V (H2S) = 33.6 L
η (SO2) = 75%

To find:
V (SO2) -?

Decision:
1) Write the equation of a chemical reaction:
2H2S + 3O2 => 2SO2 + 2H2O;
2) Calculate the amount of substance H2S:
n (H2S) = V (H2S) / Vm = 33.6 / 22.4 = 1.5 mol;
3) Determine the theoretical amount of SO2:
n theory. (SO2) = n (H2S) = 1.5 mol;
4) Calculate the practical amount of SO2:
n practical (SO2) = η (SO2) * n theory. (SO2) / 100% = 75% * 1.5 / 100% = 1.125 mol;
5) Calculate the volume of SO2:
V (SO2) = n (SO2) * Vm = 1.125 * 22.4 = 25.2 liters.

Answer: The volume of SO2 is 25.2 liters.