Chromium compounds exhibit a variety of bright colors. When solid ammonium dichromate, (NH₄)₂Cr₂O₇, a vivid orange compound, is ignited, a spectacular reaction occurs, as shown in the two photographs on the next page. Although the reaction is somewhat more complex, let’s assume here that the products are solid chromium(III) oxide, nitrogen gas (consisting of N₂ molecules), and water vapor. Balance the equation for this reaction.