Chapter 4, Problem 4.45PAE

4.45 If 21 g of H₂S is mixed with 38 g of O₂ and 31 g of SO₂ forms, what is the percentage yield?

   ${\text{2 H}}_{\text{2}}\text{S }+{\text{ 3 O}}_{\text{2}}\to {\text{ 2 SO}}_{\text{2}}+{\text{ 2 H}}_{\text{2}}\text{O}$