How much energy is released when hydrogen is fused to produce one kilo of helium?

1. Proton/proton fusion into deuterium accounts for 40% of the reactions by number, releasing 1.44 MeV of energy for each reaction: 10.4% of the Sun’s total energy.

2. Deuterium/proton fusion into helium-3 accounts for 40% of the reactions by number, releasing 5.49 MeV of energy for each reaction: 39.5% of the Sun’s total energy.

3. Helium-3/helium-3 fusion into helium-4 accounts for 17% of the reactions by number, releasing 12.86 MeV of energy for each reaction: 39.3% of the Sun’s total energy.

4. And helium-3/helium-4 fusion into two helium-4s accounts for 3% of the reactions by number, releasing 19.99 MeV of energy for each reaction: 10.8% of the Sun’s total energy.

from mass-energy equivalence of E=mc²
from mass-energy equivalence of E=mc²
image from The Sun’s Energy Doesn’t Come From Fusing Hydrogen Into Helium (Mostly) adapted from Sarang / Wikimedia Commons
image from The Sun’s Energy Doesn’t Come From Fusing Hydrogen Into Helium (Mostly,) adapted from Uwe W. and Xiaomao123 / Wikimedia Commons

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