Stoichiometry is a term chemists use to describe calculations that determine the relative quantities of reactants or products involved in a chemical reaction. Using stoichiometry, chemists can determine the amount of product that can be formed during a chemical reaction from a given amount of reactant. Chemists can also determine the amount of reactant needed to produce a desired amount of product using the same process. Select the missing conversion factor for the following set of calculations. Assume 22 grams of aluminum sulfide, Al₂S₃, react with water, H₂O, to produce aluminum hydroxide, Al(OH)₃, and hydrogen sulfide, H₂S. The problem requires that you determine the mass of water, H₂O, needed for the reaction to occur. Al₂S₃(s) + 6 H₂O(l) → 2 Al(OH)₃(aq) + 3 H₂S(g) 22 grams Al₂S₃ times 1 mole Al₂S₃ over 150.17 grams Al₂S₃ times 6 moles H₂O over 1 mole Al₂S₃ times blank equals 16 grams H₂O
1) 18.02 g H₂O over 1 mole Al₂S₃
2) 18.02 g H₂O over 6 mole H₂O
3) 1 mole H₂O over 18.02 g H₂O
4) 18.02 g H₂O over 1 mole H₂O