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The deuterium-tritium reaction releases 17.6 MeV, most of it carried by the 14.1 MeV neutron. Because the fuel nuclei are so light, the energy per kilogram beats uranium fission by roughly a factor of four - about 3.4e14 J/kg for D-T against 8.2e13 J/kg for U-235.
Reaction count
N = (mass / (2 x average molar mass)) x NA
Energy released
E = N x energy per reaction
Because two positively charged nuclei must be forced together against Coulomb repulsion, needing temperatures over 100 million kelvin. Fission only needs a neutron to arrive.
About 3.5 MeV to the helium nucleus, which stays in the plasma and heats it, and 14.1 MeV to the neutron, which escapes and is captured in the blanket.