What is the formula to create dihydrogen sulfide?

The formula for creating dihydrogen sulfide, more commonly known as hydrogen sulfide, is most commonly represented as FeS + 2 HCl --> FeCl₂ + H₂S. Fe is the symbol for iron, S is the symbol for sulfur, H is the symbol for hydrogen and Cl is the symbol for chlorine.

A less common formula to create dihydrogen sulfide is 6 H₂O + Al₂S₃ --> 3 H₂S + 2 Al(OH)₃, where O is the chemical symbol for oxygen and Al is the chemical symbol for aluminum. Both formulas allow the dihydrogen sulfide gas to be separated from the resulting solid in the reaction.