Practice Problem 3
Use the Lewis structures of NO2 and N2O4 and the stoichiometry of the following reaction to decide whether H and S favor the reactants or products of this reaction:
2 NO2(g) N2O4(g)
NO2 has an unpaired electron in its Lewis structure:
When two NO2 molecules collide in the proper orientation, a covalent bond can form between the nbitrogen atoms to produce the dimer, N2O4:
Because it forms a new bond, this reaction should be exothermic. H for this reaction therefore favors the products. The reaction leads to a decrease in the entropy of the system because the system becomes less disordered when two molecules come together to form a larger molecule S for this reaction therefore favors the reactants.