AP Chemistry Unit 2 Moles and Stoich Review Problems 1. If there are 185 grams of C6H14 How many moles of hexane are there? How many atoms of hydrogen are there? How many molecules of hexane are there? 2. Several brands of antacid tablets use aluminum hydroxide to neutralize excess acid. Al(OH)3 (s) + 3 HCl(aq) ? AlCl3 (aq) + 3 H2O(l) Molar masses: 78.01 36.46 133.4 18.02 If .750 g of aluminum hydroxide and 45mL of 1.5M hydrochloric acid are used, what would limit how much aluminum chloride is produced? What is the theoretical yield of aluminum chloride? How much excess reactant is left over?