i really need help solving these

(15) Using the reaction enthalpy, calculate the energy required to produce one kilogram of Calcium oxide by the process below. Ca(OH), () H,0 (g) + CaO AH,,=+108.5kl (15) When steam condenses to form liquid water, it releases heat into the surroundings. How much heat is released when 2.6 kilograms of steam returns to the liquid state? H20(g) H20(l) AH.m=-40.67kl (15) Draw the Lewis structures of XeF,, SFs and PCls . Organize your answers in a chart to include the number of total valence electrons, number of non-bonding electrons on the central atom, and any elements that are exceptions to the octet rule for each structure. 9) (15) For each of the following structures, derive the Lewis structure (show the number of valence electrons), and use VSEPR theory to determine the electronic structure and the molecular structure. For each of the ions listed, calculate the formal charge on each oxygen. a) NOZ_ b) ASH3 C) SH2 d) CHOz_