1. Consider the following reaction:2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many molecules of O2 are needed to make 16.2 g of B2O3?
2. Consider the reaction, 2 Al(s) + 3 Cl2(g) => 2 AlCl3(g). How many grams of AlCl3 will be made by the reaction of 7 moles of Al(s) with 27 moles of Cl2(g)?