points) to earn 1. How many moles of oxygen are needed to produce 3.0 moles of water? (s points) 2 H2 + O2 + 2 H2O 2. How many moles of hydrogen gas are needed to produce 20 grams of hydrochloric acid (HCI)? (6 points) H2 + Cl2 2 HCI 3. How many grams of butane (CH) are needed to fully react with 4 moles of oxygen? (6 points) 2 C,H,0 + 13 O, 8CO, + 10 H,O