A12S3 + 6 HCI → 2 AlC13 + 3 H25 Assume a 100% yield. How many grams of HCl are needed to produce 12.5 moles of H2S? The molar mass of Al,S; is 150.16 grams/mole. The molar mass of HCl is 36.46 grams/mole. The molar mass of AlCls is 133.33 grams/mole. The molar mass of H2S is 34.086 grams/mole.