What Energy Must Be Added or Given Off in a Reaction

question 3

Multiple Choice

What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen,1.007 825 u;neutron,1.008 665 u;helium,4.002 602 u;also,1 u = 931.5 MeV/c²)

• A) 20.7 MeV added
• B) 20.7 MeV given off
• C) 28.3 MeV given off
• D) 28.3 MeV added

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