What mass of aluminum hydroxide are needed to decompose in order to produce 65.0L of water at STP according to the following equation? Al(OH)3 → Al2O3 H20 5. How many liters of propane (C3H8) are needed to react with 15.2 liters of oxygen at STP in order to produce water and carbon dioxide? C3H8 + 02 → H20 CO2 + 6. How many grams of barium chloride are produced when 1.25 x 1023 molecules of HCL reacts with barium according to the following equation? Ba + HCI BaCl2 H2