Decomposition of 36.54 g of a pure solid compound produced 4.06 g of nitrogen gas, 10.44 g of water and a solid metal oxide. The metal oxide is found to contain 68.42 percent of chromium. What is the empirical formula of the metal oxide

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?