Deuterium is an isotope of the element hydrogen that has a nucleus consisting of one proton and one neutron. In Chapter 30, we show how two deuterium nuclei can undergo a reaction called fusion in which 6.4 × 10^–13 J is given off. Seawater contains about 154 ppm of deuterium (the ratio of deuterium to hydrogen atoms in the water.) If all the deuterium atoms in a cup of seawater undergo fusion, how much energy would be released? Your answer will explain why fusion is a potential solution to the world’s energy needs.