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What is the approximate percentage of ma...

What is the approximate percentage of mass converted into energy in the following thermonuclear reaction ?
`._1H^2+._1H^2+._1H^2 to ._2He^4 + ._1H^1 +._0n^1+21.6` MeV

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The correct Answer is:
`0.4%`
The six nucleons have a total mass of 6 amu, whose energy equivalent is 6 x 931 MeV. Divide energy released by 6 x 931 MeV and multiply by 100.
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