Cu2+ + Ag D) CH4 + O2 CO2 + H2O E) both A and B 23. Draw a Lewis structure for H3C–NO2. Both oxygen atoms are directly attached to the nitrogen atom. What is the formal charge on the nitrogen atom? A) -3 B) +1 C) +3 D) -1 E) 0 24. A 55.25 gallon container was filled with an industrial solvent whose density is 1.146 g/cm3. How many kg should the solvent in the container weigh? 26. Which statement below is true about the spectrum of hydrogen obtained in gas discharge tubes experiments? A) A photon is absorbed as the electron goes from a state with a higher energy to one with a lower energy. B) A photon is absorbed as the electron goes from a state with a lower energy to one with a higher energy. C) A photon is emitted as the electron goes from a state with a higher energy to one with a lower energy. D) A photon is emitted as the electron goes from a state with a lower energy to one with a higher energy. E) An electron is emitted as the photon goes from a state with a higher e