Each line in the spectra represents the energy 1.) absorbed as an atom loses an electron
2.) released as an electron moves from a lower energy state to a higher energy state
3.) released as an electron moves from a higher energy state to a lower energy state
4.) absorbed as an atom gains an electron

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?